An object of the present invention is to provide an ultrasonic transducer having a high sensitivity and a high durability. An ultrasonic transducer includes: a pair of upper and lower electrodes； a cavity layer having a vibration space directly sandwiched between the pair of electrodes； and an insulating layer sandwiched between the pair of electrodes and disposed around the vibration space. A vertical thickness of the insulating layer is greater than that of the cavity layer.
