An ultrasonic diagnostic equipment of the present invention includes: an ultrasonic transducer body transmitting and receiving ultrasonic waves; a swing shaft (4) attached integrally to the ultrasonic transducer body; a swing shaft pulley (5) provided on the swing shaft; a motor having an output shaft (7); an output shaft pulley (8) provided on the output shaft; a belt (9) wound around the swing shaft pulley and the output shaft pulley; a plurality of belt fixing screws (11, 12) fixing the belt to the swing shaft pulley and the output shaft pulley. The belt is divided into two regions at the belt fixing screws so as to allow the regions to have different natural frequencies.With this configuration, it is possible to provide a highly reliable ultrasonic probe and an ultrasonic diagnostic equipment using the ultrasonic probe.