The application of the invention relates to a bottle sterilizer which can be simply moved to a needed place in a state of accommodating a sterilized in a processing container. The bottle sterilizer is provided with a processing container used for accommodating a bottle a steam provider used for providing steam for the interior of the processing container and a sterilizer base provided with the steam provider. The processing container is installed on the sterilizer base in a freely detachable mode. Leading-in openings used for leading steam from the steam provider to the interior of the processing container are formed on the bottom of the processing container.
