Ultrasonic measurement device and measurement method

A measurement method of a position of a target in an ultrasonic measurement device having an ultrasonic transceiver that transmits an ultrasonic wave and receives a reflected wave reflected on the target so as to output a reception signal, the method comprising:

• moving a transmission/reception position where the ultrasonic transceiver transmits and receives the ultrasonic wave, along a first direction;
• and
• measuring the position of the target, based on the reception signal received at the transmission/reception position,
• wherein in measuring the position of the target, when a plurality of the reception signals corresponding to a plurality of reflection components caused by a difference in distances from the target are detected at a first transmission/reception position in the first direction, the position measurement unit selects the reception signal, based on a ratio between a voltage value of the plurality of reception signals at a comparison transmission/reception position different from the first transmission/reception position and a voltage value of the plurality of reception signals at the first transmission/reception position, and the position measurement unit measures the position of the target, based on the selected reception signal.