To provide a capsule for ultrasonic diagnosis capable of continuously carrying out ultrasonic observation during passing through a body without arranging a battery within the capsule.

An ultrasonic unit 10 having an ultrasonic oscillator 11, a generating section 6 constituted of a stator 62 made by winding a coil 61, a rotor 64 rotating near the coil 61, a control section 7, a wireless transceiver section 8, and a power section 9 rotating the ultrasonic oscillator 11 and the rotor 64 are arranged within the ultrasonic capsule 1. The power section 9 employs the mechanism of the movement of a mechanical clock and is constituted a movement barrel 20, a row of rings 30, and an escapement speed control mechanism section 40, the ultrasonic oscillator 11 and the rotor 64 are rotated at a predetermined rotating speed by restoring force of a spiral spring 22 arranged in the movement barrel 20 during a predetermined time. Consequently, an ultrasonic tomogram can be obtained after the capsule 5 is swallowed from a mouth till the capsule is discharged from an anus.