A food heating device includes a conveying unit, a heating unit, and a suction unit. The conveying unit has an endless belt member which allows hot air to pass therethrough. The belt member has an outgoing side on which the food is placed, and a return side, wherein the outgoing side passes through a space between the heating unit and the suction unit, and the return side is disposed to face the outgoing side and avoid the space between the heating unit and the suction unit.