A DC brushless motor used to drive blades that perform stirring in a heating chamber, the motor comprising: a housing including a plurality of attachment portions each of which is arranged to extend toward one axial side where the heating chamber is located, a base portion arranged on an opposite axial side of the attachment portions and joined to the attachment portions, and a bearing holding portion joined to the base portion; a bearing member held by the bearing holding portion; a shaft supported by the bearing member to be rotatable about a central axis, and including a portion on the one axial side to which the blades that perform stirring in the heating chamber are joinable; a rotor holder fixed to the shaft, being in or substantially in a shape of a covered cylinder with an opening facing toward the opposite axial side, and including a cover portion and a cylindrical portion; a rotor magnet held on an inside of the cylindrical portion of the rotor holder; a stator arranged radially inside the rotor magnet; and a circuit board electrically connected with the stator, and arranged axially facing the opening of the rotor holder; wherein the cover portion of the rotor holder includes a through hole (223, 223A) passing therethrough in an axial direction, and a blade (224, 224A), integrally defined with the cover portion and arranged to produce air current; wherein the blade (224, 224A) of the cover portion of the rotor holder is a plate-shaped portion arranged to extend from the cover portion toward the one axial side; wherein the blade (224, 224A) of the cover portion of the rotor holder is arranged adjacent to and on one circumferential side of the through hole (223, 223A); and wherein the blade (224, 224A) of the cover portion of the rotor holder is arranged to extend from a position radially outward of a radially inner end of the through hole (223, 223A) to a position radially inward of a radially outer end of the through hole (223, 223A) characterized in that a wall surface arranged to separate the heating chamber and the rotor holder is provided on the one axial side of the blade (224, 224A) of the cover portion of the rotor holder; the blade (224, 224A) of the cover portion of the rotor holder is arranged to produce air current passing from the opposite axial side toward the one axial side; the attachment portions extend from the base portion toward the wall surface and are fixed to the wall surface; the shaft is arranged to extend into the heating chamber; and an end portion of the blade (224, 224A) of the cover portion of the rotor holder on the one axial side is arranged on the opposite axial side relative to an attachment surface of each attachment portion. a housing including a plurality of attachment portions each of which is arranged to extend toward one axial side where the heating chamber is located, a base portion arranged on an opposite axial side of the attachment portions and joined to the attachment portions, and a bearing holding portion joined to the base portion; a bearing member held by the bearing holding portion; a shaft supported by the bearing member to be rotatable about a central axis, and including a portion on the one axial side to which the blades that perform stirring in the heating chamber are joinable; a rotor holder fixed to the shaft, being in or substantially in a shape of a covered cylinder with an opening facing toward the opposite axial side, and including a cover portion and a cylindrical portion; a rotor magnet held on an inside of the cylindrical portion of the rotor holder; a stator arranged radially inside the rotor magnet; and a circuit board electrically connected with the stator, and arranged axially facing the opening of the rotor holder; wherein the cover portion of the rotor holder includes a through hole (223, 223A) passing therethrough in an axial direction, and a blade (224, 224A), integrally defined with the cover portion and arranged to produce air current; wherein the blade (224, 224A) of the cover portion of the rotor holder is a plate-shaped portion arranged to extend from the cover portion toward the one axial side; wherein the blade (224, 224A) of the cover portion of the rotor holder is arranged adjacent to and on one circumferential side of the through hole (223, 223A); and wherein the blade (224, 224A) of the cover portion of the rotor holder is arranged to extend from a position radially outward of a radially inner end of the through hole (223, 223A) to a position radially inward of a radially outer end of the through hole (223, 223A) characterized in that a wall surface arranged to separate the heating chamber and the rotor holder is provided on the one axial side of the blade (224, 224A) of the cover portion of the rotor holder; the blade (224, 224A) of the cover portion of the rotor holder is arranged to produce air current passing from the opposite axial side toward the one axial side; the attachment portions extend from the base portion toward the wall surface and are fixed to the wall surface; the shaft is arranged to extend into the heating chamber; and an end portion of the blade (224, 224A) of the cover portion of the rotor holder on the one axial side is arranged on the opposite axial side relative to an attachment surface of each attachment portion.