ULTRASONIC OBJECT DETECTION DEVICE

An ultrasonic object detection device includes a vibrating plate made of resin, an ultrasonic sensor, and an ultrasonic absorber. The vibrating plate made of resin is disposed outside a door that opens and closes an opening part of a vehicle body so as to extend in the vehicle length direction. The ultrasonic sensor is disposed on an inner surface of the vibrating plate, and can transmit and receive an ultrasonic wave. The ultrasonic absorber is disposed so as to cover the inner surface of the vibrating plate including the ultrasonic sensor.