PURPOSE: To prevent an unnecessary cornering lamp from being lighted in time of car stoppage, by constituting a controller so as to light the cornering lamp in time of detecting the on-operation of a right or left turn signal lamp switch and car running.

CONSTITUTION: In the case where a car is stopped at the left side of a road and a turn signal lamp 3a at the left is blinked in a state that a light switch 10 is turned to a small lamp position S, when a detecting signal out of a running detector 13 fails to be outputted, whereas a cornering lamp switch 11b comes into a state of being turned to ON following an on-state in a turn signal lamp switch 11a, a power feed lamp switch 15 cuts off the feed of a battery power source through the cornering lamp switch 11b so that a cornering lamp 1b is no longer lighted.