diff --git a/components/NumaTimer.tsx b/components/NumaTimer.tsx
index e38ddd5..7d72b57 100644
--- a/components/NumaTimer.tsx
+++ b/components/NumaTimer.tsx
@@ -1,4 +1,4 @@
-import { useCallback } from "react"
+import { useCallback, useRef } from "react"
 
 import {
   DOMAIN_LABEL,
@@ -6,6 +6,7 @@ import {
   type DomainKey,
   type NumaTimerUiState
 } from "~lib/config"
+import { pickReminderMessage } from "~lib/messages"
 import { useTimer } from "~hooks/useTimer"
 import type { DeepPartial } from "~lib/deepMerge"
 
@@ -40,6 +41,7 @@ const DOMAIN_THEME: Record<
   }
 }
 
+
 export const NumaTimer = ({
   domain,
   uiState,
@@ -54,6 +56,7 @@ export const NumaTimer = ({
   const { displaySeconds } = useTimer(domain)
   const theme = DOMAIN_THEME[domain]
   const isCollapsed = uiState.collapsed[domain]
+  const reminderMessageRef = useRef(pickReminderMessage())
 
   const handleToggleCollapsed = useCallback(() => {
     void setUiState((prev) => ({
@@ -160,7 +163,7 @@ export const NumaTimer = ({
               fontSize: "14px",
               color: theme.subText
             }}>
-            この時間はもう戻りません
+            {reminderMessageRef.current}
           </div>
         </>
       )}
diff --git a/lib/messages.ts b/lib/messages.ts
new file mode 100644
index 0000000..65bb541
--- /dev/null
+++ b/lib/messages.ts
@@ -0,0 +1,10 @@
+const REMINDER_MESSAGES = [
+  "この時間はもう戻りません",
+  "今日の時間は有限です",
+  "いまの使い方で未来が決まる",
+  "今この瞬間も、過去に変わっています",
+  "一度きりの今日を大切に",
+] as const
+
+export const pickReminderMessage = () =>
+  REMINDER_MESSAGES[Math.floor(Math.random() * REMINDER_MESSAGES.length)]