diff --git a/src/slash-command/stats.js b/src/slash-command/stats.js
index e28945a..73dc09c 100644
--- a/src/slash-command/stats.js
+++ b/src/slash-command/stats.js
@@ -1,7 +1,6 @@
 // @ts-check
 import { SlashCommandBuilder } from 'discord.js';
 import { searchTrack } from '../const/track.js';
-import { toMilliseconds } from '../util/time.js';
 
 /** @type { import('../types.js').SlashCommand } */
 export default {
@@ -21,7 +20,7 @@ export default {
       throw new Error(`コースが見つかりませんでした。\n入力されたコース名:  ${trackQuery}`);
     }
 
-    const stats = await nitaRepository.selectStats(track.code, toMilliseconds(track.nitaVSWRMilliseconds));
+    const stats = await nitaRepository.selectStats(track.code, track.nitaVSWRMilliseconds);
     console.info(stats);
 
     await interaction.reply({
diff --git a/src/util/time.test.js b/src/util/time.test.js
new file mode 100644
index 0000000..9c75972
--- /dev/null
+++ b/src/util/time.test.js
@@ -0,0 +1,21 @@
+// @ts-check
+import { describe, expect, test } from 'vitest';
+import { toMilliseconds } from './time.js';
+
+describe('toMilliseconds', () => {
+  describe('1分台で繰り上がらない', () => {
+    test('1:39:999', () => {
+      expect(toMilliseconds(139999)).toBe(99999);
+    });
+  });
+  describe('1分台で繰り上がる', () => {
+    test('1:40:000', () => {
+      expect(toMilliseconds(140000)).toBe(100000);
+    });
+  });
+  describe('2分台', () => {
+    test('2:00:000', () => {
+      expect(toMilliseconds(200000)).toBe(120000);
+    });
+  });
+});