A restricting projecting portion is provided on an upper surface of a bracket in the vicinity of an apex portion of an angled cam projecting portion for guiding the movement of a shaft portion of a ratchet. When an operation lever and a bracket are returned to a neutral position from a left-turn indicating position or a right-turn indicating position, the force of the shaft portion of the ratchet is weakened through the abutment of the shaft portion of the ratchet against a bearing surface of the restricting projecting portion, whereby the passage of the shaft portion across the apex portion of the cam projecting portion to an opposite side is restricted. This facilitates the stopping of the bracket and hence the operation lever at the neutral position.