diff --git a/src/page/TableComposition/components/TimerCreationContent/TimerCreationContent.tsx b/src/page/TableComposition/components/TimerCreationContent/TimerCreationContent.tsx
index 2a2363a7..1557f2b1 100644
--- a/src/page/TableComposition/components/TimerCreationContent/TimerCreationContent.tsx
+++ b/src/page/TableComposition/components/TimerCreationContent/TimerCreationContent.tsx
@@ -95,6 +95,7 @@ interface BellInputConfig {
   count: number;
 }
 
+const MAX_SPEAKER_LEN = 5;
 export default function TimerCreationContent({
   beforeData,
   initData,
@@ -307,14 +308,15 @@ export default function TimerCreationContent({
     // SpeechType에 맞게 문자열 매핑
     let speechTypeToSend: string;
     let stanceToSend: Stance;
+    if (speaker.trim().length > MAX_SPEAKER_LEN) {
+      errors.push(`발언자는 최대 ${MAX_SPEAKER_LEN}자까지 입력할 수 있습니다.`);
+    }
+
     if (currentSpeechType === 'CUSTOM') {
       // 텍스트 길이 유효성 검사
       if (speechTypeTextValue.length > 10) {
         errors.push('발언 유형은 최대 10자까지 입력할 수 있습니다.');
       }
-      if (speaker.length > 5) {
-        errors.push('발언자는 최대 5자까지 입력할 수 있습니다.');
-      }
 
       // 발언시간 유효성 검사
       if (
@@ -596,9 +598,12 @@ export default function TimerCreationContent({
                     <ClearableInput
                       id="speaker"
                       value={speaker}
-                      onChange={(e) => setSpeaker(e.target.value)}
+                      onChange={(e) =>
+                        setSpeaker(e.target.value.slice(0, MAX_SPEAKER_LEN))
+                      }
                       onClear={() => setSpeaker('')}
-                      placeholder="N번 토론자"
+                      maxLength={MAX_SPEAKER_LEN}
+                      placeholder="N번"
                       disabled={
                         stance === 'NEUTRAL' || currentSpeechType === 'TIMEOUT'
                       }