An inclination sensor detecting an inclination state by rotating a pendulum type movement rotatably installed in a case to detect a portion magnetized by the movement by a magnetic sensor. A spacer isloosely fitted to a shaft inserted, through a clearance, into a shaft hole about which the movement is rotated, and the movement is fitted to the case through the space to bring the movement and theshaft in an unrestricted state. Since the responsiveness of the movement is improved and the vibration of a vehicle body is prevented from being transmitted to the movement through the shaft, the stability of the movement can be increased.