PURPOSE: To control a flickering driving circuit, elimimate the need for memory functions and enable flickering operation to be performed stably to noise by judging the opening and closing operations of a direction indicating switch with a simple logic constitution through the effective utilization of plural control information quantities.

CONSTITUTION: The device has a power source 10, a switch 11, a current detecting resistance 6, a relay 5 and a series connection path to a direction indicating lamp 8 via direction indicating switch 7. When the switch 7 is closed, an integrated circuit 8 intermittently drives the relay 5 to cause the indicating lamp 8 to flicker. When in the circuit 9 a comparator 1 detects the disconnection of the indicating lamp 8, it applies a discrimination signal 16 to a flickering driving circuit 3, thereby changing the filckering condition of the direction indicating lamp 8. A comparator 2 detects the opening and closing states of the switches 7, 5b and outputs a detection signal 17 to a flickering operation control circuit 15. The circuit 15 suitably controls the operation of the circuit 3 by the output 17 and the signal from L terminal 12.