A heating cooking apparatus comprising: a heating cooking chamber where an object to be heated is accommodated; a heat supply unit (41, 42, 44) configured to supply heat to an interior of the heating cooking chamber; a housing configured to accommodate the heating cooking chamber; a fan disposed in a space formed between an outer surface of the heating cooking chamber and an inner surface of the housing and configured to generate an air flow; a pull-out body configured to be pulled out freely relative to the heating cooking chamber; a slide rail attached to the outer surface of the heating cooking chamber and configured to slidably support the pull-out body; a guide portion (52a, 52c) configured to guide the air flow to flow the air flow along the slide rail; the heating cooking apparatus being characterized in that it further comprises: a support portion attached to the outer surface of the heating cooking chamber and configured to support the slide rail, wherein the support portion includes a distribution portion configured to form an inner space where the air flow flows between the distribution portion and the outer surface of the heating cooking chamber, and the distribution portion includes two fixing portions (211, 212) where the slide rail is fixed, and a notched portion formed between the two fixing portions (211, 212) in a sliding direction where the pull-out body slides. a heating cooking chamber where an object to be heated is accommodated; a heat supply unit (41, 42, 44) configured to supply heat to an interior of the heating cooking chamber; a housing configured to accommodate the heating cooking chamber; a fan disposed in a space formed between an outer surface of the heating cooking chamber and an inner surface of the housing and configured to generate an air flow; a pull-out body configured to be pulled out freely relative to the heating cooking chamber; a slide rail attached to the outer surface of the heating cooking chamber and configured to slidably support the pull-out body; a guide portion (52a, 52c) configured to guide the air flow to flow the air flow along the slide rail; the heating cooking apparatus being characterized in that it further comprises: a support portion attached to the outer surface of the heating cooking chamber and configured to support the slide rail, wherein the support portion includes a distribution portion configured to form an inner space where the air flow flows between the distribution portion and the outer surface of the heating cooking chamber, and the distribution portion includes two fixing portions (211, 212) where the slide rail is fixed, and a notched portion formed between the two fixing portions (211, 212) in a sliding direction where the pull-out body slides. a support portion attached to the outer surface of the heating cooking chamber and configured to support the slide rail, wherein the support portion includes a distribution portion configured to form an inner space where the air flow flows between the distribution portion and the outer surface of the heating cooking chamber, and the distribution portion includes two fixing portions (211, 212) where the slide rail is fixed, and a notched portion formed between the two fixing portions (211, 212) in a sliding direction where the pull-out body slides.