A steam generation device is placed at a lower portion of a side wall of a heating chamber. A steam jet-out part is placed upper than the steam generation device of the side wall of the heating chamber with a distance from the steam generation device. Thus, even if bumping has occurred within a water storage part of the steam generation device, causing boiling water to rush out from a steam supply port into a steam supply pipe, the boiling water is prevented from intruding into a steam jet-out part.
