diff --git a/package-lock.json b/package-lock.json
index fb8699e0eb..73dd92f404 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8428,6 +8428,15 @@
       "integrity": "sha512-qKD5Pbq+QMk4nea4lMuncUMhpEiQwaJyCW7MrvissnRcBDENhVfDmAqQYRQ3X525oTzhar9Zh1cK0L2d1UKYcw==",
       "dev": true
     },
+    "electron-window-state": {
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/electron-window-state/-/electron-window-state-5.0.3.tgz",
+      "integrity": "sha512-1mNTwCfkolXl3kMf50yW3vE2lZj0y92P/HYWFBrb+v2S/pCka5mdwN3cagKm458A7NjndSwijynXgcLWRodsVg==",
+      "requires": {
+        "jsonfile": "^4.0.0",
+        "mkdirp": "^0.5.1"
+      }
+    },
     "elegant-spinner": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/elegant-spinner/-/elegant-spinner-1.0.1.tgz",
@@ -10081,8 +10090,7 @@
     "graceful-fs": {
       "version": "4.2.6",
       "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.6.tgz",
-      "integrity": "sha512-nTnJ528pbqxYanhpDYsi4Rd8MAeaBA67+RZ10CM1m3bTAVFEDcd5AuA4a6W5YkGZ1iNXHzZz8T6TBKLeBuNriQ==",
-      "dev": true
+      "integrity": "sha512-nTnJ528pbqxYanhpDYsi4Rd8MAeaBA67+RZ10CM1m3bTAVFEDcd5AuA4a6W5YkGZ1iNXHzZz8T6TBKLeBuNriQ=="
     },
     "graceful-readlink": {
       "version": "1.0.1",
@@ -11740,7 +11748,6 @@
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-4.0.0.tgz",
       "integrity": "sha1-h3Gq4HmbZAdrdmQPygWPnBDjPss=",
-      "dev": true,
       "requires": {
         "graceful-fs": "^4.1.6"
       }
@@ -12847,8 +12854,7 @@
     "minimist": {
       "version": "1.2.5",
       "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
-      "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
-      "dev": true
+      "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw=="
     },
     "minipass": {
       "version": "3.1.3",
@@ -12955,7 +12961,6 @@
       "version": "0.5.5",
       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
       "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
-      "dev": true,
       "requires": {
         "minimist": "^1.2.5"
       }
diff --git a/package.json b/package.json
index d2188e82f6..cac1556160 100644
--- a/package.json
+++ b/package.json
@@ -34,6 +34,7 @@
     "dayjs": "1.10.7",
     "electron-log": "4.4.1",
     "electron-store": "8.0.0",
+    "electron-window-state": "5.0.3",
     "encoding-japanese": "1.0.30",
     "immer": "9.0.2",
     "lodash.debounce": "4.0.8",
diff --git a/src/background.ts b/src/background.ts
index 1a41da3b2d..583fbe0d17 100644
--- a/src/background.ts
+++ b/src/background.ts
@@ -35,10 +35,12 @@ import {
   ToolbarSetting,
   ActivePointScrollMode,
   EngineInfo,
+  SplitterPosition,
 } from "./type/preload";
 
 import log from "electron-log";
 import dayjs from "dayjs";
+import windowStateKeeper from "electron-window-state";
 
 // silly以上のログをコンソールに出力
 log.transports.console.format = "[{h}:{i}:{s}.{ms}] [{level}] {text}";
@@ -206,6 +208,7 @@ const store = new Store<{
   experimentalSetting: ExperimentalSetting;
   acceptRetrieveTelemetry: AcceptRetrieveTelemetryStatus;
   acceptTerms: AcceptTermsStatus;
+  splitterPosition: SplitterPosition;
 }>({
   schema: {
     useGpu: {
@@ -357,6 +360,15 @@ const store = new Store<{
       enum: ["Unconfirmed", "Accepted", "Rejected"],
       default: "Unconfirmed",
     },
+    splitterPosition: {
+      type: "object",
+      properties: {
+        portraitPaneWidth: { type: "number" },
+        audioInfoPaneWidth: { type: "number" },
+        audioDetailPaneHeight: { type: "number" },
+      },
+      default: {},
+    },
   },
   migrations: {},
 });
@@ -737,9 +749,16 @@ let willQuit = false;
 let filePathOnMac: string | null = null;
 // create window
 async function createWindow() {
+  const mainWindowState = windowStateKeeper({
+    defaultWidth: 800,
+    defaultHeight: 600,
+  });
+
   win = new BrowserWindow({
-    width: 800,
-    height: 600,
+    x: mainWindowState.x,
+    y: mainWindowState.y,
+    width: mainWindowState.width,
+    height: mainWindowState.height,
     frame: false,
     titleBarStyle: "hidden",
     trafficLightPosition: { x: 6, y: 4 },
@@ -811,6 +830,8 @@ async function createWindow() {
       }
     }
   });
+
+  mainWindowState.manage(win);
 }
 
 const menuTemplateForMac: Electron.MenuItemConstructorOptions[] = [
@@ -1162,6 +1183,14 @@ ipcMainHandle("SET_EXPERIMENTAL_SETTING", (_, experimentalSetting) => {
   store.set("experimentalSetting", experimentalSetting);
 });
 
+ipcMainHandle("GET_SPLITTER_POSITION", () => {
+  return store.get("splitterPosition");
+});
+
+ipcMainHandle("SET_SPLITTER_POSITION", (_, splitterPosition) => {
+  store.set("splitterPosition", splitterPosition);
+});
+
 // app callback
 app.on("web-contents-created", (e, contents) => {
   // リンククリック時はブラウザを開く
diff --git a/src/electron/preload.ts b/src/electron/preload.ts
index f0c9afb6ab..20138beb7d 100644
--- a/src/electron/preload.ts
+++ b/src/electron/preload.ts
@@ -263,6 +263,14 @@ const api: Sandbox = {
     return await ipcRendererInvoke("SET_EXPERIMENTAL_SETTING", setting);
   },
 
+  getSplitterPosition: async () => {
+    return await ipcRendererInvoke("GET_SPLITTER_POSITION");
+  },
+
+  setSplitterPosition: async (splitterPosition) => {
+    return await ipcRendererInvoke("SET_SPLITTER_POSITION", splitterPosition);
+  },
+
   getDefaultHotkeySettings: async () => {
     return await ipcRendererInvoke("GET_DEFAULT_HOTKEY_SETTINGS");
   },
diff --git a/src/store/index.ts b/src/store/index.ts
index dd25070060..8cab554663 100644
--- a/src/store/index.ts
+++ b/src/store/index.ts
@@ -177,6 +177,7 @@ export const indexStore: VoiceVoxStoreOptions<
       promises.push(dispatch("GET_ACCEPT_RETRIEVE_TELEMETRY"));
       promises.push(dispatch("GET_ACCEPT_TERMS"));
       promises.push(dispatch("GET_EXPERIMENTAL_SETTING"));
+      promises.push(dispatch("GET_SPLITTER_POSITION"));
 
       await Promise.all(promises).then(() => {
         dispatch("ON_VUEX_READY");
diff --git a/src/store/setting.ts b/src/store/setting.ts
index 3d2514f70c..94e9c7c2fe 100644
--- a/src/store/setting.ts
+++ b/src/store/setting.ts
@@ -46,6 +46,11 @@ export const settingStoreState: SettingStoreState = {
     enablePreset: false,
     enableInterrogativeUpspeak: false,
   },
+  splitterPosition: {
+    audioDetailPaneHeight: undefined,
+    audioInfoPaneWidth: undefined,
+    portraitPaneWidth: undefined,
+  },
 };
 
 export const settingStore: VoiceVoxStoreOptions<
@@ -102,6 +107,9 @@ export const settingStore: VoiceVoxStoreOptions<
     SET_ACCEPT_TERMS(state, { acceptTerms }) {
       state.acceptTerms = acceptTerms;
     },
+    SET_SPLITTER_POSITION(state, { splitterPosition }) {
+      state.splitterPosition = splitterPosition;
+    },
   },
   actions: {
     GET_SAVING_SETTING({ commit }) {
@@ -237,6 +245,15 @@ export const settingStore: VoiceVoxStoreOptions<
       window.electron.setExperimentalSetting(experimentalSetting);
       commit("SET_EXPERIMENTAL_SETTING", { experimentalSetting });
     },
+    GET_SPLITTER_POSITION({ dispatch }) {
+      window.electron.getSplitterPosition().then((splitterPosition) => {
+        dispatch("SET_SPLITTER_POSITION", { splitterPosition });
+      });
+    },
+    SET_SPLITTER_POSITION({ commit }, { splitterPosition }) {
+      window.electron.setSplitterPosition(splitterPosition);
+      commit("SET_SPLITTER_POSITION", { splitterPosition });
+    },
   },
 };
 
diff --git a/src/store/type.ts b/src/store/type.ts
index 368162cfdb..432a67c8a8 100644
--- a/src/store/type.ts
+++ b/src/store/type.ts
@@ -25,6 +25,7 @@ import {
   Preset,
   ActivePointScrollMode,
   EngineInfo,
+  SplitterPosition,
 } from "@/type/preload";
 import { IEngineConnectorFactory } from "@/infrastructures/EngineConnector";
 import { QVueGlobals } from "quasar";
@@ -767,6 +768,7 @@ export type SettingStoreState = {
   themeSetting: ThemeSetting;
   acceptRetrieveTelemetry: AcceptRetrieveTelemetryStatus;
   experimentalSetting: ExperimentalSetting;
+  splitterPosition: SplitterPosition;
 };
 
 type SettingStoreTypes = {
@@ -835,6 +837,15 @@ type SettingStoreTypes = {
     mutation: { experimentalSetting: ExperimentalSetting };
     action(payload: { experimentalSetting: ExperimentalSetting }): void;
   };
+
+  GET_SPLITTER_POSITION: {
+    action(): void;
+  };
+
+  SET_SPLITTER_POSITION: {
+    mutation: { splitterPosition: SplitterPosition };
+    action(payload: { splitterPosition: SplitterPosition }): void;
+  };
 };
 
 export type SettingGetters = StoreType<SettingStoreTypes, "getter">;
diff --git a/src/type/ipc.d.ts b/src/type/ipc.d.ts
index 67a2491737..7ea78f89f4 100644
--- a/src/type/ipc.d.ts
+++ b/src/type/ipc.d.ts
@@ -262,6 +262,16 @@ type IpcIHData = {
     return: void;
   };
 
+  GET_SPLITTER_POSITION: {
+    args: [];
+    return: import("@/type/preload").SplitterPosition;
+  };
+
+  SET_SPLITTER_POSITION: {
+    args: [splitterPosition: import("@/type/preload").SplitterPosition];
+    return: void;
+  };
+
   THEME: {
     args: [obj: { newData?: string }];
     return: import("@/type/preload").ThemeSetting | void;
diff --git a/src/type/preload.d.ts b/src/type/preload.d.ts
index 32a85c93d9..b9c22ec77f 100644
--- a/src/type/preload.d.ts
+++ b/src/type/preload.d.ts
@@ -82,6 +82,8 @@ export interface Sandbox {
   setAcceptTerms(acceptTerms: AcceptTermsStatus): Promise<void>;
   getExperimentalSetting(): Promise<ExperimentalSetting>;
   setExperimentalSetting(setting: ExperimentalSetting): Promise<void>;
+  getSplitterPosition(): Promise<SplitterPosition>;
+  setSplitterPosition(splitterPosition: SplitterPosition): Promise<void>;
   getDefaultHotkeySettings(): Promise<HotKeySetting[]>;
   getDefaultToolbarSetting(): Promise<ToolbarSetting>;
   theme(newData?: string): Promise<ThemeSetting | void>;
@@ -265,3 +267,9 @@ export type ExperimentalSetting = {
   enablePreset: boolean;
   enableInterrogativeUpspeak: boolean;
 };
+
+export type SplitterPosition = {
+  portraitPaneWidth: number | undefined;
+  audioInfoPaneWidth: number | undefined;
+  audioDetailPaneHeight: number | undefined;
+};
diff --git a/src/views/Home.vue b/src/views/Home.vue
index ae10f12190..c0f137c9a7 100644
--- a/src/views/Home.vue
+++ b/src/views/Home.vue
@@ -31,7 +31,8 @@
           class="full-width"
           before-class="overflow-hidden"
           :disable="!shouldShowPanes"
-          v-model="audioDetailPaneHeight"
+          :model-value="audioDetailPaneHeight"
+          @update:model-value="updateAudioDetailPane"
         >
           <template #before>
             <q-splitter
@@ -40,7 +41,8 @@
               :separator-style="{ width: shouldShowPanes ? '3px' : 0 }"
               before-class="overflow-hidden"
               :disable="!shouldShowPanes"
-              v-model="portraitPaneWidth"
+              :model-value="portraitPaneWidth"
+              @update:model-value="updatePortraitPane"
             >
               <template #before>
                 <character-portrait />
@@ -54,7 +56,8 @@
                   :separator-style="{ width: shouldShowPanes ? '3px' : 0 }"
                   class="full-width overflow-hidden"
                   :disable="!shouldShowPanes"
-                  v-model="audioInfoPaneWidth"
+                  :model-value="audioInfoPaneWidth"
+                  @update:model-value="updateAudioInfoPane"
                 >
                   <template #before>
                     <div
@@ -173,7 +176,11 @@ import DictionaryManageDialog from "@/components/DictionaryManageDialog.vue";
 import { AudioItem } from "@/store/type";
 import { QResizeObserver } from "quasar";
 import path from "path";
-import { HotkeyAction, HotkeyReturnType } from "@/type/preload";
+import {
+  HotkeyAction,
+  HotkeyReturnType,
+  SplitterPosition,
+} from "@/type/preload";
 import { parseCombo, setHotkeyFunctions } from "@/store/setting";
 
 export default defineComponent({
@@ -303,6 +310,38 @@ export default defineComponent({
       }
     };
 
+    const splitterPosition = computed<SplitterPosition>(
+      () => store.state.splitterPosition
+    );
+
+    const updateSplitterPosition = async (
+      propertyName: keyof SplitterPosition,
+      newValue: number
+    ) => {
+      const newSplitterPosition = {
+        ...splitterPosition.value,
+        [propertyName]: newValue,
+      };
+      store.dispatch("SET_SPLITTER_POSITION", {
+        splitterPosition: newSplitterPosition,
+      });
+    };
+
+    const updatePortraitPane = async (width: number) => {
+      portraitPaneWidth.value = width;
+      await updateSplitterPosition("portraitPaneWidth", width);
+    };
+
+    const updateAudioInfoPane = async (width: number) => {
+      audioInfoPaneWidth.value = width;
+      await updateSplitterPosition("audioInfoPaneWidth", width);
+    };
+
+    const updateAudioDetailPane = async (height: number) => {
+      audioDetailPaneHeight.value = height;
+      await updateSplitterPosition("audioDetailPaneHeight", height);
+    };
+
     // component
     let audioCellRefs: Record<string, typeof AudioCell> = {};
     const addAudioCellRef = (audioCellRef: typeof AudioCell) => {
@@ -363,15 +402,37 @@ export default defineComponent({
       if (val === old) return;
 
       if (val) {
-        portraitPaneWidth.value = DEFAULT_PORTRAIT_PANE_WIDTH;
-        audioInfoPaneWidth.value = MIN_AUDIO_INFO_PANE_WIDTH;
+        const clamp = (value: number, min: number, max: number) =>
+          Math.max(Math.min(value, max), min);
+
+        // 設定ファイルを書き換えれば異常な値が入り得るのですべてclampしておく
+        portraitPaneWidth.value = clamp(
+          splitterPosition.value.portraitPaneWidth ??
+            DEFAULT_PORTRAIT_PANE_WIDTH,
+          MIN_PORTRAIT_PANE_WIDTH,
+          MAX_PORTRAIT_PANE_WIDTH
+        );
+
+        audioInfoPaneWidth.value = clamp(
+          splitterPosition.value.audioInfoPaneWidth ??
+            MIN_AUDIO_INFO_PANE_WIDTH,
+          MIN_AUDIO_INFO_PANE_WIDTH,
+          MAX_AUDIO_INFO_PANE_WIDTH
+        );
         audioInfoPaneMinWidth.value = MIN_AUDIO_INFO_PANE_WIDTH;
         audioInfoPaneMaxWidth.value = MAX_AUDIO_INFO_PANE_WIDTH;
-        audioDetailPaneHeight.value = MIN_AUDIO_DETAIL_PANE_HEIGHT;
+
         audioDetailPaneMinHeight.value = MIN_AUDIO_DETAIL_PANE_HEIGHT;
         changeAudioDetailPaneMaxHeight(
           resizeObserverRef.value?.$el.parentElement.clientHeight
         );
+
+        audioDetailPaneHeight.value = clamp(
+          splitterPosition.value.audioDetailPaneHeight ??
+            MIN_AUDIO_DETAIL_PANE_HEIGHT,
+          audioDetailPaneMinHeight.value,
+          audioDetailPaneMaxHeight.value
+        );
       } else {
         portraitPaneWidth.value = 0;
         audioInfoPaneWidth.value = 0;
@@ -582,6 +643,9 @@ export default defineComponent({
       audioDetailPaneHeight,
       audioDetailPaneMinHeight,
       audioDetailPaneMaxHeight,
+      updatePortraitPane,
+      updateAudioInfoPane,
+      updateAudioDetailPane,
       isCompletedInitialStartup,
       engineState,
       isHelpDialogOpenComputed,
diff --git a/tests/unit/store/Vuex.spec.ts b/tests/unit/store/Vuex.spec.ts
index 86b4b9d681..623e8ff2e9 100644
--- a/tests/unit/store/Vuex.spec.ts
+++ b/tests/unit/store/Vuex.spec.ts
@@ -80,6 +80,11 @@ describe("store/vuex.js test", () => {
           enablePreset: false,
           enableInterrogativeUpspeak: false,
         },
+        splitterPosition: {
+          audioDetailPaneHeight: 200,
+          audioInfoPaneWidth: 20,
+          portraitPaneWidth: 50,
+        },
       },
       getters: {
         ...uiStore.getters,
@@ -173,5 +178,12 @@ describe("store/vuex.js test", () => {
       store.state.experimentalSetting.enableInterrogativeUpspeak,
       false
     );
+    assert.propertyVal(
+      store.state.splitterPosition,
+      "audioDetailPaneHeight",
+      200
+    );
+    assert.propertyVal(store.state.splitterPosition, "audioInfoPaneWidth", 20);
+    assert.propertyVal(store.state.splitterPosition, "portraitPaneWidth", 50);
   });
 });