RELAY DEVICE

To provide a relay device which can reduce a relay time of a high-speed message, while securing the security of message communication.SOLUTION: The relay device includes: a first determination unit which determines whether or not a message received from an external-vehicle appliance is a high-speed message which includes data that is required to be transmitted to an in-vehicle appliance within a fixed time, to transfer the received message to a predetermined route based on the determination result; a second determination unit which acquires a message to determine whether or not the acquired message is an illegal message; and a relay processing unit which acquires a message to be able to relay at least to the in-vehicle appliance. The high-speed message is output from the relay processing unit to the second determination unit and the in-vehicle appliance through a first route which reaches the relay processing unit from the first determination unit without passing through the second determination unit. A general message is output from the relay processing unit to the in-vehicle appliance through a second route which reaches the relay processing unit from the first determination unit through the second determination unit.SELECTED DRAWING: Figure 1 【課題】メッセージ通信のセキュリティ性を確保しつつ高速メッセージについては中継時間を短縮できる中継装置を提供する。【解決手段】車外機器から受信したメッセージが所定時間内に車内機器への送信が要求されるデータを含む高速メッセージであるか否かを判断し、判断結果に基づいて受信メッセージを所定の経路で転送する第１判断部と、メッセージを取得して不正メッセージであるか否かを判断する第２判断部と、メッセージを取得して少なくとも車内機器へ中継可能な中継処理部とを備え、高速メッセージは、第１判断部から第２判断部を経由せずに中継処理部に至る第１経路を通じて、中継処理部から第２判断部及び車内機器に出力され、通常メッセージは、第１判断部から第２判断部を経由して中継処理部に至る第２経路を通じて、中継処理部から車内機器に出力される。【選択図】図１