To provide a turn signal switch that miniaturizes a case by using the switch as a hazard switch and can reduce manufacturing cost while improving workability in incorporation.

This turn signal switch comprises the case 1 fixable to a handle bar, and an operation knob 2 that can be oscillated right or left from the neutral position about the oscillation shaft disposed in the case 1 and can be pressed from the neutral position in the projection direction. A winker on a desired side disposed in a two-wheel vehicle is blinked by oscillating the operation knob 2, and the blinking is canceled by pressing the operation knob 2. The operation knob 2 can be oscillated right while being pressed, can be locked to the case 1 in the operation state, and can simultaneously blink winkers on both sides in the locked state.

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