An ultrasonograph for carrying out examination simply and quickly while achieving high resolution and high-speed processing, an ultrasonic transducer, an examining instrument, and ultrasonographing device the subject matter are disclosed. Piezoelectric layers constituting an ultrasonic transducer are made of barium titanate BaTiO3 or lead titanate zirconate PZT is used and the thickness of each piezoelectric layer is 0.1 to 100 microm. The ultrasonograph comprises a drive unit for driving one of the piezoelectric layers, a sensing unit for sensing electric signals generated by piezoelectric layers receiving echos from the object subjected to ultrasonic wave transmitted by the driven piezoelectric layer, and a processing unit for visualizing the state of the subjected object by processing the sensed electric signal.