There is provided a steam generating apparatus including: a heater including a lower linear section and an upper linear section which are spaced apart from each other and have a predetermined length, and a curved section connecting the lower linear section and the upper linear section; a heating module including: a heater accommodation pipe which has a same shape as the heater and encloses an outside of the heater; a cover plate which is attached to both open ends of the heater accommodation pipe; a horizontal partition which is disposed between a lower linear section and an upper linear section of the heater accommodation pipe; and a heat dissipation pin which protrudes from at least part of the heater accommodation pipe; and a case which is configured to enclose the heating module and is secured to the cover plate.