To provide a laminated sheet transformer with a high coupling coefficient between primary and secondary sides, and to provide low cost ultrasonic diagnostic equipment having an excellent transfer characteristic by using this laminated sheet transformer.

On at least one of the front and back sides of the laminated transformer, a coil patterns 6, 7 are formed, a mat-type iron core patterns 8, 9 are formed in the central parts of the coil patterns 6, 7 respectively, layers 4, 5 of a printed board consisting of a plurality of layers with the central parts of the coil patterns thereof being aligned are provided, the coil patterns 6, 7 are so connected that they form the primary winding and the secondary winding, and the iron core patterns 8, 9 are connected with via-holes 10 so that they form a magnetic path. The ultrasonic diagnostic equipment uses this laminated sheet transformer in a pulse transmitting circuit for driving an ultrasonic vibrator.