Systems and methods are provided to reduce noise generated by water and gas discharged after a sterilization treatment, and to prevent adhesion of condensation water on an object to be sterilized. The sterilizer according to the embodiments of the present invention may include a can body having a heater and capable of housing an object to be sterilized a steam discharge pipe connected to the can body and having an opening and closing means for opening and closing a channel to enable discharging of steam and a discharged steam tank provided partway along the steam discharge pipe and having a greater channel cross-sectional area than that of the steam discharge pipe.
