A cooking device has, in a cooking chamber thereof, a cooking tray (91) which is to be placed in the heating chamber (2) so as to have a gap against a rear portion (2d) of the heating chamber (2) and on which a heating object (15) to be heated is to be mounted directly or indirectly, a rear blowoff port (29) which is provided in the rear portion (2d) of the heating chamber (2) so as to be positioned on an upper side of the gap and near a rear portion of the cooking tray (91) and which is communicated with a duct (18) so as to allow the heat medium to be blown off into the heating chamber (2), and a flow regulation structure (62) provided on a rear side of the rear blowoff port (29) and arranged to regulate a flow of the heat medium. The flow regulation structure (62) has, on a lower side thereof, a first guide surface (63) extending in a direction generally parallel to a horizontal direction.