A germicidal heating apparatus comprising a water supply part for supplying water, an superheated vapor generation part for generating superheated vapor by using the water supplied from the water supply part, and a blower for blowing the superheated vapor generated by the superheated vapor generation part through a discharge opening, characterized in that the superheated vapor generation part includes an annular vessel for receiving the water from the water supply part, and a spiral sheath heater arranged on the whole inside peripheral surface of the annular vessel, the upper end of the inside wall of the annular vessel being bent closely contacting the outside wall so as both to prevent leakage of the water contained in the annular vessel and to discharge the vapor generated by the heat of the sheath heater.
