A sterile-substance-supplying apparatus comprising: an atomization unit including a reservoir unit to reserve hydrogen peroxide, and an ultrasound vibrator to impart ultrasound vibration to the reserved hydrogen peroxide to be atomized; an evaporation unit, provided above the reservoir unit, that heats the atomized hydrogen peroxide to be evaporated; a connecting member connecting the evaporation unit and the atomization unit to each other; a hydrogen-peroxide-supply port to allow the hydrogen peroxide to be supplied to the reservoir unit; a carrier-gas-supply port, provided at the connecting member, that allows carrier gas for allowing the atomized hydrogen peroxide to flow to the evaporation unit to be supplied; and a container portion to reserve a substance for transmitting the ultrasound vibration generated by the ultrasound vibrator, and a metal vibrating plate, provided at a bottom portion of the reservoir unit, that transmits to the hydrogen peroxide the ultrasound vibration transmitted through the substance.