Configuration structure of sensor

The configuration structure of the sensor can improve the degree of freedom of sensor setting. The arrangement structure of the sensor is provided with a belt wheel which rotates around a rotating shaft and a sensor which detects rotation of the belt wheel. The belt wheel is provided with a fixed belt wheel; a movable pulley that is displaceable relative to the fixed pulley in the direction of the rotation axis; a plunger of an oil chamber is formed on the back surface of the movable pulley, a detected part is arranged on the plunger in a region which can be visually confirmed from the direction of the rotating shaft, and the sensor is arranged on a supporting part which rotatably supports the fixed pulley along the direction of the rotating shaft and is opposite to the region in which the detected part is arranged. 本发明的传感器的配置结构可提高传感器设置的自由度。该传感器的配置结构具有：绕旋转轴旋转的带轮、检测所述带轮的旋转的传感器，所述带轮具有：固定带轮；在所述旋转轴方向上相对于所述固定带轮可相对位移的可动带轮；在所述可动带轮的背面形成油室的柱塞，在所述柱塞，在从所述旋转轴方向可视觉确认的区域设有被检测部，所述传感器以沿着所述旋转轴的朝向设置于将所述固定带轮支承为可旋转的支承部，并与设置有所述被检