An ultrasonic transducer includes: a first electrode layer disposed on an upper substrate and a support； a second electrode layer which is disposed on a lower surface of the upper substrate and is separated from the first electrode layer； an upper electrode disposed on an upper surface of a membrane to contact an upper surface of the first electrode layer； a trench formed through the upper electrode, the membrane, the support, and the upper substrate； and a pad substrate disposed under the upper substrate and including bonding pads that electrically connect to the first and second electrode layers, respectively.
