An ultrasonic device includes an ultrasonic transceiver having a flat ultrasonic wave transmitting/receiving surface and an acoustic lens provided on the ultrasonic wave transmitting/receiving surface. The acoustic lens has a first acoustic lens layer on the side facing away from the ultrasonic wave transmitting/receiving surface and a second acoustic lens layer on the side facing the ultrasonic wave transmitting/receiving surface. The first acoustic lens layer and the second acoustic lens layer have different attenuation coefficients. The interface between the first acoustic lens layer and the second acoustic lens layer is parallel to the ultrasonic wave transmitting/receiving surface.
