diff --git a/src/backend/browser/fileImpl.ts b/src/backend/browser/fileImpl.ts
index 4df490efce..9b5c5e3728 100644
--- a/src/backend/browser/fileImpl.ts
+++ b/src/backend/browser/fileImpl.ts
@@ -243,13 +243,13 @@ export const readFileImpl = async (filePath: string) => {
 // 返り値はファイルパスではなく、疑似パスを返す
 export const showExportFilePickerImpl: (typeof window)[typeof SandboxKey]["showExportFileDialog"] =
   async (obj: {
-    defaultName?: string;
+    defaultPath?: string;
     extensionName: string;
     extensions: string[];
     title: string;
   }) => {
     const handle = await showSaveFilePicker({
-      suggestedName: obj.defaultName,
+      suggestedName: obj.defaultPath,
       types: [
         {
           description: obj.extensions.join("、"),
diff --git a/src/backend/browser/sandbox.ts b/src/backend/browser/sandbox.ts
index 87876e2893..f2fda877d2 100644
--- a/src/backend/browser/sandbox.ts
+++ b/src/backend/browser/sandbox.ts
@@ -137,7 +137,7 @@ export const api: Sandbox = {
     return fileHandle?.[0];
   },
   async showExportFileDialog(obj: {
-    defaultName?: string;
+    defaultPath?: string;
     extensionName: string;
     extensions: string[];
     title: string;
diff --git a/src/backend/electron/main.ts b/src/backend/electron/main.ts
index 6c9ee5a42e..be092f8a26 100644
--- a/src/backend/electron/main.ts
+++ b/src/backend/electron/main.ts
@@ -573,12 +573,12 @@ registerIpcMainHandle<IpcMainHandle>({
 
   SHOW_EXPORT_FILE_DIALOG: async (
     _,
-    { title, defaultName, extensionName, extensions },
+    { title, defaultPath, extensionName, extensions },
   ) => {
     const result = await retryShowSaveDialogWhileSafeDir(() =>
       dialog.showSaveDialog(win, {
         title,
-        defaultPath: defaultName,
+        defaultPath,
         filters: [{ name: extensionName, extensions: extensions }],
         properties: ["createDirectory"],
       }),
diff --git a/src/backend/electron/preload.ts b/src/backend/electron/preload.ts
index 72d7768e27..878c8f6448 100644
--- a/src/backend/electron/preload.ts
+++ b/src/backend/electron/preload.ts
@@ -64,10 +64,10 @@ const api: Sandbox = {
     });
   },
 
-  showExportFileDialog: ({ title, defaultName, extensionName, extensions }) => {
+  showExportFileDialog: ({ title, defaultPath, extensionName, extensions }) => {
     return ipcRendererInvokeProxy.SHOW_EXPORT_FILE_DIALOG({
       title,
-      defaultName,
+      defaultPath,
       extensionName,
       extensions,
     });
diff --git a/src/store/audio.ts b/src/store/audio.ts
index 31aceaae07..d433b55ef6 100644
--- a/src/store/audio.ts
+++ b/src/store/audio.ts
@@ -1372,7 +1372,7 @@ export const audioStore = createPartialStore<AudioStoreTypes>({
         } else {
           filePath ??= await window.backend.showExportFileDialog({
             title: "音声を保存",
-            defaultName: defaultAudioFileName,
+            defaultPath: defaultAudioFileName,
             extensionName: "WAV ファイル",
             extensions: ["wav"],
           });
@@ -1521,7 +1521,7 @@ export const audioStore = createPartialStore<AudioStoreTypes>({
         } else {
           filePath ??= await window.backend.showExportFileDialog({
             title: "音声を全て繋げて保存",
-            defaultName: defaultFileName,
+            defaultPath: defaultFileName,
             extensionName: "WAV ファイル",
             extensions: ["wav"],
           });
@@ -1666,7 +1666,7 @@ export const audioStore = createPartialStore<AudioStoreTypes>({
         } else {
           filePath ??= await window.backend.showExportFileDialog({
             title: "文章を全て繋げてテキストファイルに保存",
-            defaultName: defaultFileName,
+            defaultPath: defaultFileName,
             extensionName: "テキストファイル",
             extensions: ["txt"],
           });
diff --git a/src/store/singing.ts b/src/store/singing.ts
index 30899f89d3..82be06deb4 100644
--- a/src/store/singing.ts
+++ b/src/store/singing.ts
@@ -2770,7 +2770,7 @@ export const singingStore = createPartialStore<SingingStoreTypes>({
           } else {
             filePath ??= await window.backend.showExportFileDialog({
               title: "音声を保存",
-              defaultName: fileName,
+              defaultPath: fileName,
               extensions: ["wav"],
               extensionName: "WAV ファイル",
             });
@@ -3532,7 +3532,7 @@ export const singingStore = createPartialStore<SingingStoreTypes>({
 
           let filePath = await window.backend.showExportFileDialog({
             title: "プロジェクトを書き出し",
-            defaultName: fileBaseName,
+            defaultPath: fileBaseName,
             extensionName: fileTypeLabel,
             extensions: [extension],
           });
diff --git a/src/type/ipc.ts b/src/type/ipc.ts
index 11ffed2ced..c0abc26d97 100644
--- a/src/type/ipc.ts
+++ b/src/type/ipc.ts
@@ -57,7 +57,7 @@ export type IpcIHData = {
     args: [
       obj: {
         title: string;
-        defaultName?: string;
+        defaultPath?: string;
         extensionName: string;
         extensions: string[];
       },
diff --git a/src/type/preload.ts b/src/type/preload.ts
index 743a7afa14..24c8f4d6db 100644
--- a/src/type/preload.ts
+++ b/src/type/preload.ts
@@ -91,7 +91,7 @@ export interface Sandbox {
   }): Promise<string | undefined>;
   showExportFileDialog(obj: {
     title: string;
-    defaultName?: string;
+    defaultPath?: string;
     extensionName: string;
     extensions: string[];
   }): Promise<string | undefined>;