A turn signal canceling device for a motorcycle includes a straight-ahead travel or turn determining unit for determining whether the motorcycle is travelling straight ahead or is turning and a turn signal cancellation controller which automatically cancels turn signal operation. When a vehicle speed is not greater than a predetermined speed and a driving force is at least a predetermined driving force at a time the straight-ahead travel or turn determining unit determines that the motorcycle is turning, the turn signal cancellation controller enters a standby state. When the straight-ahead travel or turn determining unit determines that the motorcycle is travelling straight ahead during the standby state, the turn signal cancellation controller automatically deactivates a turn signal. When the driving force becomes smaller than the predetermined driving force or turn signal becomes manually deactivated during the standby state, the turn signal cancellation controller returns to the normal operating state.