Sensor positioning device

A sensor positioning device comprising:

• two sensors that detect a position of a position measurement target in cooperation with a sensor provided in or on the position measurement target;
• sensor holding jigs that hold the two sensors, respectively, at arbitrary height positions;
• an inter-sensor distance measurement jig that measures a distance between the two sensors in a horizontal or substantially horizontal direction, and that functions as a reference at a time of setting the distance between the two sensors in the horizontal or substantially horizontal direction to a predetermined target distance;
• and
• reference-setting jigs of sensor height position, each including a weight and a weight suspension member;
• wherein
• a lengthwise direction of the weight suspension member is oriented in a vertical direction when the weight is suspended;
• each of the reference-setting jigs of sensor height position is structured to set a target height of a respective one of the sensors such that the target height of the respective one of the sensors coincides with a total distance of a vertical direction dimension of the weight, a length of the weight suspension member, and a distance from an upper end of the weight suspension member to the respective one of the sensors, in a state where the weight is attached to a respective one of the sensor holding jigs via the weight suspension member, and the weight is in contact with a reference surface in a height direction;
• the height positions of the two sensors are adjusted to respective target height positions set by the reference-setting jigs of sensor height position;
• and
• a distance between the two sensors is adjusted to the target distance based on the distance between the two sensors determined by the inter-sensor distance measurement jig.