diff --git a/notification-domain/src/main/kotlin/io/github/v1servicenotification/error/ErrorCode.kt b/notification-domain/src/main/kotlin/io/github/v1servicenotification/error/ErrorCode.kt
index 3bb57967..03ec9d7e 100644
--- a/notification-domain/src/main/kotlin/io/github/v1servicenotification/error/ErrorCode.kt
+++ b/notification-domain/src/main/kotlin/io/github/v1servicenotification/error/ErrorCode.kt
@@ -21,4 +21,6 @@ enum class ErrorCode(
     DETAIL_NOT_FOUND(404, "DETAIL-404-1", "Detail Not Found."),
 
     INTERNAL_SERVER_ERROR(500, "GLOBAL-500-1", "Internal Server Error."),
+
+    DEVICE_TOKEN_LENGTH(401, "DEVICE-400-1", "Device Token Length Error.")
 }
diff --git a/notification-domain/src/main/kotlin/io/github/v1servicenotification/error/InvalidDeviceTokenLengthException.kt b/notification-domain/src/main/kotlin/io/github/v1servicenotification/error/InvalidDeviceTokenLengthException.kt
new file mode 100644
index 00000000..6f8a8bf4
--- /dev/null
+++ b/notification-domain/src/main/kotlin/io/github/v1servicenotification/error/InvalidDeviceTokenLengthException.kt
@@ -0,0 +1,9 @@
+package io.github.v1servicenotification.error
+
+class InvalidDeviceTokenLengthException private constructor(): NotificationException(ErrorCode.DEVICE_TOKEN_LENGTH) {
+
+    companion object {
+        @JvmField
+        val EXCEPTION = InvalidDeviceTokenLengthException()
+    }
+}
diff --git a/notification-infrastructure/src/main/kotlin/io/github/v1servicenotification/global/fcm/FcmService.kt b/notification-infrastructure/src/main/kotlin/io/github/v1servicenotification/global/fcm/FcmService.kt
index 0c9596a3..2e0d0f5d 100644
--- a/notification-infrastructure/src/main/kotlin/io/github/v1servicenotification/global/fcm/FcmService.kt
+++ b/notification-infrastructure/src/main/kotlin/io/github/v1servicenotification/global/fcm/FcmService.kt
@@ -7,53 +7,66 @@ import com.google.firebase.messaging.Message
 import com.google.firebase.messaging.MulticastMessage
 import com.google.firebase.messaging.Notification
 import io.github.v1servicenotification.detail.spi.PostDetailFcmSpi
+import io.github.v1servicenotification.error.InvalidDeviceTokenLengthException
 import org.springframework.stereotype.Service
 
 @Service
 class FcmService: PostDetailFcmSpi {
 
+    companion object {
+        const val MAX_TOKEN_LENGTH = 163
+    }
+
     override fun sendGroupMessage(tokenList: List<String>, title: String, content: String, threadId: String) {
-        val multicast = MulticastMessage.builder()
-            .addAllTokens(tokenList)
-            .setNotification(
-                Notification.builder()
-                    .setTitle(title)
-                    .setBody(content)
-                    .build()
-            )
-            .setApnsConfig(
-                ApnsConfig.builder()
-                    .setAps(
-                        Aps.builder()
-                            .setSound("default")
-                            .setThreadId(threadId)
-                            .build()
-                    ).build()
-            )
-            .build()
+        val validTokens = tokenList.filter { it.length == MAX_TOKEN_LENGTH }
+        if (validTokens.isNotEmpty()) {
+            val multicast = MulticastMessage.builder()
+                .addAllTokens(validTokens)
+                .setNotification(
+                    Notification.builder()
+                        .setTitle(title)
+                        .setBody(content)
+                        .build()
+                )
+                .setApnsConfig(
+                    ApnsConfig.builder()
+                        .setAps(
+                            Aps.builder()
+                                .setSound("default")
+                                .setThreadId(threadId)
+                                .build()
+                        ).build()
+                )
+                .build()
 
-        FirebaseMessaging.getInstance().sendMulticastAsync(multicast)
+            FirebaseMessaging.getInstance().sendMulticastAsync(multicast)
+        }
     }
 
     override fun sendMessage(token: String, title: String, content: String, threadId: String) {
-        val message = Message.builder()
-            .setToken(token)
-            .setNotification(
-                Notification.builder()
-                    .setTitle(title)
-                    .setBody(content)
-                    .build()
-            )
-            .setApnsConfig(
-                ApnsConfig.builder()
-                    .setAps(
-                        Aps.builder()
-                            .setSound("default")
-                            .setThreadId(threadId)
-                            .build()
-                    ).build()
-            )
-            .build()
-        FirebaseMessaging.getInstance().sendAsync(message)
+        if (token.length >= MAX_TOKEN_LENGTH) {
+            val message = Message.builder()
+                .setToken(token)
+                .setNotification(
+                    Notification.builder()
+                        .setTitle(title)
+                        .setBody(content)
+                        .build()
+                )
+                .setApnsConfig(
+                    ApnsConfig.builder()
+                        .setAps(
+                            Aps.builder()
+                                .setSound("default")
+                                .setThreadId(threadId)
+                                .build()
+                        ).build()
+                )
+                .build()
+            FirebaseMessaging.getInstance().sendAsync(message)
+        } else {
+            throw InvalidDeviceTokenLengthException.EXCEPTION
+        }
     }
+
 }