To provide a heating cooker capable of securing the operability of an operation part for ignition and adjustment of fire power while securing the operability of a slide-type door member.

A flap 16 is mounted on an upper edge of a grill opening 15 in a state of being rotatable on a rotating shaft in the width direction of a main body case 5. The flap 16 is a member to allow the heat of high temperatures discharged from a grill chamber 10 less liable to flow to a user side (upper part), when the grill door 13 is opened after grill cooking. When the grill door 13 is opened and a grill pan 11 is drawn out, the flap 15 is rotated to a front side to be an opened state, and when the grill door 13 is closed and the grill chamber 10 is kept in a closed state, the flap 16 is rotated to a depth side to be a closed state.