A substance discharge device (100) is provided with an oscillation unit (120) which oscillates an amplitude-modulated ultrasonic wave group obtained by modulating the amplitudes of ultrasonic waves to the surface of a discharger (200) of an excretory substance, and a control unit (130) which controls the amplitudes of the ultrasonic waves of the amplitude-modulated ultrasonic wave group oscillated by the oscillation unit (120) on the basis of the drift speed of the excretory substance with respect to the discharger (200). Consequently, the excretory substance is discharged to the outside of the discharger from the surface of the discharger such as a human body using ultrasonic oscillation, thereby achieving efficient discharge corresponding to the excretory substance.
