A heating cooker comprising: a heating chamber; a cooker body that has the heating chamber; a door of the cooker body, the door performing an opening operation and a closing operation with respect to a heating chamber opening which is provided on a front surface of the heating chamber; and a damper unit that is provided on the cooker body and comes into contact with the door before the door abuts on the cooker body during the closing operation of the door, wherein the damper unit includes: a damper that has an impact absorption tip portion which is contracted by impact; characterized by: a damper holder that holds the damper and is attached to a heat insulation member which is disposed via space between the damper holder and a wall surface of the heating chamber; a damper cap that is always pressed in a direction in which the damper cap abuts on the door by the impact absorption tip portion, abuts on the door during the closing operation of the door, and slides with respect to the damper holder, and transfers impact during abutment on the door to the impact absorption tip portion; wherein the damper cap includes an abutment end that projects from a damper opening which is formed in a heating chamber outer edge portion which constitutes an outer peripheral portion of the heating chamber opening, in an opened state of the heating chamber; a flange portion that is formed at a base of a projection portion of the abutment end and radially expands; and a slider that slides with the damper holder along with a contraction operation of the impact absorption tip portion after the abutment end is abutted on the door, during the closing operation of the door, and wherein the damper opening is configured so as to be closed by the flange portion by the abutment end projecting. a heating chamber; a cooker body that has the heating chamber; a door of the cooker body, the door performing an opening operation and a closing operation with respect to a heating chamber opening which is provided on a front surface of the heating chamber; and a damper unit that is provided on the cooker body and comes into contact with the door before the door abuts on the cooker body during the closing operation of the door, wherein the damper unit includes: a damper that has an impact absorption tip portion which is contracted by impact; characterized by: a damper holder that holds the damper and is attached to a heat insulation member which is disposed via space between the damper holder and a wall surface of the heating chamber; a damper cap that is always pressed in a direction in which the damper cap abuts on the door by the impact absorption tip portion, abuts on the door during the closing operation of the door, and slides with respect to the damper holder, and transfers impact during abutment on the door to the impact absorption tip portion; wherein the damper cap includes an abutment end that projects from a damper opening which is formed in a heating chamber outer edge portion which constitutes an outer peripheral portion of the heating chamber opening, in an opened state of the heating chamber; a flange portion that is formed at a base of a projection portion of the abutment end and radially expands; and a slider that slides with the damper holder along with a contraction operation of the impact absorption tip portion after the abutment end is abutted on the door, during the closing operation of the door, and a damper that has an impact absorption tip portion which is contracted by impact; characterized by: a damper holder that holds the damper and is attached to a heat insulation member which is disposed via space between the damper holder and a wall surface of the heating chamber; a damper cap that is always pressed in a direction in which the damper cap abuts on the door by the impact absorption tip portion, abuts on the door during the closing operation of the door, and slides with respect to the damper holder, and transfers impact during abutment on the door to the impact absorption tip portion; a damper holder that holds the damper and is attached to a heat insulation member which is disposed via space between the damper holder and a wall surface of the heating chamber; a damper cap that is always pressed in a direction in which the damper cap abuts on the door by the impact absorption tip portion, abuts on the door during the closing operation of the door, and slides with respect to the damper holder, and transfers impact during abutment on the door to the impact absorption tip portion; wherein the damper cap includes an abutment end that projects from a damper opening which is formed in a heating chamber outer edge portion which constitutes an outer peripheral portion of the heating chamber opening, in an opened state of the heating chamber; a flange portion that is formed at a base of a projection portion of the abutment end and radially expands; and a slider that slides with the damper holder along with a contraction operation of the impact absorption tip portion after the abutment end is abutted on the door, during the closing operation of the door, and wherein the damper opening is configured so as to be closed by the flange portion by the abutment end projecting.