The cleaning apparatus includes a reservoir tank for reserving a cleaning fluid, a pressure-feed unit for feeding the cleaning fluid while pressurizing the cleaning fluid above the atmospheric pressure, a heating unit for heating the cleaning fluid pressure-fed from the pressure-feed unit above an atmospheric pressure boiling point of the cleaning fluid, a gas supply unit for supplying a gas and an injection unit connected to the heating unit and the gas supply unit for injecting the cleaning fluid pressurized by the pressure-feeding unit and heated by the heating unit as a pressurized superheated cleaning fluid and the gas supplied from the gas supply unit to the member at the same time.