A heating cooking apparatus comprising: a heating cooking chamber where an object to be heated is accommodated; a heat supply unit 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 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 (IR) 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 where the slide rail is fixed, and a notched portion formed between the two fixing portions 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 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 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 (IR) 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 where the slide rail is fixed, and a notched portion formed between the two fixing portions 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 (IR) 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 where the slide rail is fixed, and a notched portion formed between the two fixing portions in a sliding direction where the pull-out body slides. <EOS>