diff --git a/lambda/publish-from-log/publish_from_log.py b/lambda/publish-from-log/publish_from_log.py
index b6200cc7..aa2c4529 100644
--- a/lambda/publish-from-log/publish_from_log.py
+++ b/lambda/publish-from-log/publish_from_log.py
@@ -8,8 +8,9 @@ import boto3
 
 sns_client = boto3.client('sns')
 
+
 def lambda_handler(event, context):
-    awslogs_dict = event.get('awslogs') 
+    awslogs_dict = event.get('awslogs')
     base64_data = awslogs_dict.get('data')
     try:
         decoded_gzip_data = base64.b64decode(base64_data)
@@ -18,12 +19,16 @@ def lambda_handler(event, context):
     log_event_str = gzip.GzipFile(fileobj=BytesIO(decoded_gzip_data)).read()
     log_event = json.loads(log_event_str)
 
+    # SNSのSubjectパラメータは100文字までという制限があるため、100文字に切り出す
+    subject = f'Detect Error(or Warning) in {log_event.get("logGroup")}'
+    subject = subject[:97] + '...' if len(subject) > 100 else subject
+
     publish_message = {
-        'Subject': f'Detect Error(or Warning) in {log_event.get("logGroup")}',
+        'Subject': subject,
         'Message': '\n'.join([log.get('message') for log in log_event.get('logEvents')]),
         'TopicArn': os.environ.get('SNS_TOPIC_ARN')
     }
-    
+
     print(publish_message)
-    
+
     sns_client.publish(**publish_message)