diff --git a/src/components/AudioCell.vue b/src/components/AudioCell.vue
index 17fa418f03..c515547309 100644
--- a/src/components/AudioCell.vue
+++ b/src/components/AudioCell.vue
@@ -7,6 +7,13 @@
       size="sm"
       class="absolute active-arrow"
     />
+    <div
+      class="line-number"
+      :class="{ active: isActiveAudioCell }"
+      v-if="showTextLineNumber"
+    >
+      {{ textLineNumberIndex }}
+    </div>
     <character-button
       :character-infos="userOrderedCharacterInfos"
       :loading="isInitializingSpeaker"
@@ -186,6 +193,19 @@ const pasteOnAudioCell = async (event: ClipboardEvent) => {
   }
 };
 
+// 行番号を表示するかどうか
+const showTextLineNumber = computed(() => store.state.showTextLineNumber);
+// 行番号
+const textLineNumberIndex = computed(
+  () => audioKeys.value.indexOf(props.audioKey) + 1
+);
+// 行番号の幅: 2桁はデフォで入るように, 3桁以上は1remずつ広げる
+const textLineNumberWidth = computed(() => {
+  const indexDigits = String(audioKeys.value.length).length;
+  if (indexDigits <= 2) return "1.5rem";
+  return `${indexDigits - 0.5}rem`;
+});
+
 // 上下に移動
 const audioKeys = computed(() => store.state.audioKeys);
 const moveUpCell = (e?: KeyboardEvent) => {
@@ -275,6 +295,21 @@ const isMultipleEngine = computed(() => store.state.engineIds.length > 1);
     height: 2rem;
   }
 
+  .line-number {
+    height: 2rem;
+    width: v-bind(textLineNumberWidth);
+    line-height: 2rem;
+    margin-right: -0.3rem;
+    opacity: 0.6;
+    text-align: right;
+    color: colors.$display;
+    &.active {
+      opacity: 1;
+      font-weight: bold;
+      color: colors.$primary-light;
+    }
+  }
+
   .q-input {
     :deep(.q-field__control) {
       height: 2rem;
diff --git a/src/components/SettingDialog.vue b/src/components/SettingDialog.vue
index 336cdf32d9..e01a5d7556 100644
--- a/src/components/SettingDialog.vue
+++ b/src/components/SettingDialog.vue
@@ -527,6 +527,28 @@
                   ]"
                 />
               </q-card-actions>
+              <q-card-actions class="q-px-md q-py-none bg-surface">
+                <div>行番号の表示</div>
+                <div>
+                  <q-icon name="help_outline" size="sm" class="help-hover-icon">
+                    <q-tooltip
+                      :delay="500"
+                      anchor="center left"
+                      self="center right"
+                      transition-show="jump-left"
+                      transition-hide="jump-right"
+                    >
+                      テキスト欄の左側に行番号を表示します。
+                    </q-tooltip>
+                  </q-icon>
+                </div>
+                <q-space />
+                <q-toggle
+                  :model-value="showTextLineNumber"
+                  @update:model-value="changeShowTextLineNumber($event)"
+                >
+                </q-toggle>
+              </q-card-actions>
             </q-card>
 
             <!-- Experimental Card -->
@@ -823,6 +845,7 @@ const activePointScrollModeOptions: Record<
 
 const experimentalSetting = computed(() => store.state.experimentalSetting);
 
+// 外観
 const currentThemeNameComputed = computed({
   get: () => store.state.themeSetting.currentTheme,
   set: (currentTheme: string) => {
@@ -838,6 +861,18 @@ const availableThemeNameComputed = computed(() => {
     });
 });
 
+const editorFont = computed(() => store.state.editorFont);
+const changeEditorFont = (editorFont: EditorFontType) => {
+  store.dispatch("SET_EDITOR_FONT", { editorFont });
+};
+
+const showTextLineNumber = computed(() => store.state.showTextLineNumber);
+const changeShowTextLineNumber = (showTextLineNumber: boolean) => {
+  store.dispatch("SET_SHOW_TEXT_LINE_NUMBER", {
+    showTextLineNumber,
+  });
+};
+
 const currentAudioOutputDeviceComputed = computed<{
   key: string;
   label: string;
@@ -1042,11 +1077,6 @@ const changeSplitTextWhenPaste = (
   store.dispatch("SET_SPLIT_TEXT_WHEN_PASTE", { splitTextWhenPaste });
 };
 
-const editorFont = computed(() => store.state.editorFont);
-const changeEditorFont = (editorFont: EditorFontType) => {
-  store.dispatch("SET_EDITOR_FONT", { editorFont });
-};
-
 const showsFilePatternEditDialog = ref(false);
 
 const selectedEngineIdRaw = ref<EngineId | undefined>(undefined);
diff --git a/src/store/setting.ts b/src/store/setting.ts
index e9e0df87ce..a463d00074 100644
--- a/src/store/setting.ts
+++ b/src/store/setting.ts
@@ -40,6 +40,7 @@ export const settingStoreState: SettingStoreState = {
     availableThemes: [],
   },
   editorFont: "default",
+  showTextLineNumber: false,
   acceptRetrieveTelemetry: "Unconfirmed",
   experimentalSetting: {
     enablePreset: false,
@@ -82,6 +83,12 @@ export const settingStore = createPartialStore<SettingStoreTypes>({
         });
       }
 
+      dispatch("SET_SHOW_TEXT_LINE_NUMBER", {
+        showTextLineNumber: await window.electron.getSetting(
+          "showTextLineNumber"
+        ),
+      });
+
       dispatch("SET_ACCEPT_RETRIEVE_TELEMETRY", {
         acceptRetrieveTelemetry: await window.electron.getSetting(
           "acceptRetrieveTelemetry"
@@ -252,6 +259,18 @@ export const settingStore = createPartialStore<SettingStoreTypes>({
     },
   },
 
+  SET_SHOW_TEXT_LINE_NUMBER: {
+    mutation(state, { showTextLineNumber }) {
+      state.showTextLineNumber = showTextLineNumber;
+    },
+    action({ commit }, { showTextLineNumber }) {
+      window.electron.setSetting("showTextLineNumber", showTextLineNumber);
+      commit("SET_SHOW_TEXT_LINE_NUMBER", {
+        showTextLineNumber,
+      });
+    },
+  },
+
   SET_ACCEPT_RETRIEVE_TELEMETRY: {
     mutation(state, { acceptRetrieveTelemetry }) {
       state.acceptRetrieveTelemetry = acceptRetrieveTelemetry;
diff --git a/src/store/type.ts b/src/store/type.ts
index 88034e8c27..1833f467ac 100644
--- a/src/store/type.ts
+++ b/src/store/type.ts
@@ -998,6 +998,7 @@ export type SettingStoreState = {
   engineManifests: Record<EngineId, EngineManifest>;
   themeSetting: ThemeSetting;
   editorFont: EditorFontType;
+  showTextLineNumber: boolean;
   acceptRetrieveTelemetry: AcceptRetrieveTelemetryStatus;
   experimentalSetting: ExperimentalSetting;
   splitTextWhenPaste: SplitTextWhenPasteType;
@@ -1036,6 +1037,11 @@ export type SettingStoreTypes = {
     action(payload: { editorFont: EditorFontType }): void;
   };
 
+  SET_SHOW_TEXT_LINE_NUMBER: {
+    mutation: { showTextLineNumber: boolean };
+    action(payload: { showTextLineNumber: boolean }): void;
+  };
+
   SET_ACCEPT_RETRIEVE_TELEMETRY: {
     mutation: { acceptRetrieveTelemetry: AcceptRetrieveTelemetryStatus };
     action(payload: {
diff --git a/src/type/preload.ts b/src/type/preload.ts
index 71ff3df43f..5337b79ccd 100644
--- a/src/type/preload.ts
+++ b/src/type/preload.ts
@@ -568,6 +568,7 @@ export const electronStoreSchema = z
     defaultPresetKeys: z.record(voiceIdSchema, presetKeySchema).default({}),
     currentTheme: z.string().default("Default"),
     editorFont: z.enum(["default", "os"]).default("default"),
+    showTextLineNumber: z.boolean().default(false),
     experimentalSetting: experimentalSettingSchema.passthrough().default({}),
     acceptRetrieveTelemetry: z
       .enum(["Unconfirmed", "Accepted", "Refused"])
diff --git a/tests/unit/store/Vuex.spec.ts b/tests/unit/store/Vuex.spec.ts
index da9b166298..bbd54c9333 100644
--- a/tests/unit/store/Vuex.spec.ts
+++ b/tests/unit/store/Vuex.spec.ts
@@ -75,6 +75,7 @@ describe("store/vuex.js test", () => {
           availableThemes: [],
         },
         editorFont: "default",
+        showTextLineNumber: false,
         isPinned: false,
         isFullscreen: false,
         presetItems: {},
@@ -241,6 +242,7 @@ describe("store/vuex.js test", () => {
       store.state.experimentalSetting.enableInterrogativeUpspeak,
       false
     );
+    assert.equal(store.state.showTextLineNumber, false);
     assert.propertyVal(
       store.state.splitterPosition,
       "audioDetailPaneHeight",