To provide an ultrasonic probe having excellent operability without increasing the size of the ultrasonic probe, and an ultrasonic image with a high quality of ultrasonogram by an ultrasonic diagnostic apparatus using the probe.

Ultrasonic vibrators 1 which are two-dimensionally arranged in the form of a matrix, a plurality of wiring bundles 5 having flexibility and electrically connected correspondingly to the ultrasonic vibrators arranged in each line or each row of the matrix, and wiring boards 3 electrically connected to the wiring bundles are equipped. The apparatus has a structure to connect at least two wiring bundles to one sheet of the wiring boards. While reducing the number of the wiring boards used and removing an unnecessary space by the deformation of the flexible wiring bundles, the ultrasonic probe can be stored in a case, and an increase in the size of the ultrasonic probe is suppressed.