PURPOSE: To inspect the disconnection of a multiconductor electrical cable where a connected is mounted at both terminals and a nonconnective state between the cable and the connector.

CONSTITUTION: Two inspection connectors 2a and 2b which are connected to a connector 4 which is mounted to a multiconductor electrical cable 3 are provided and LEDs 6 (6a-6n) are connected in series to each corresponding pin 5 (5a-5n). A battery is connected to the LEDs 6. A multiconductor electrical cable 3 is connected to inspection connectors 2a and 2b via the connector 4, thus rocking the cable 3. The LEDs 6 corresponding to the cable which positively continues to the multiconductor electrical cable 3 light up and the LEDs 6 corresponding to disconnection and nonconnective state do not light up.