A DC brushless motor includes a housing (31) including a plurality of attachment portions (311) each of which is arranged to extend toward an apparatus, a base portion (312) joined to the attachment portions (311), and a bearing holding portion (313) joined to the base portion (312); a bearing member (13) held by the bearing holding portion (313); a shaft (21) supported by the bearing member (13) to be rotatable about a central axis (J1), and having a portion on one axial side to which blades (43) designed for stirring in a heating chamber (41) are joinable; a rotor holder (22) fixed to the shaft (21), and being substantially in a shape of a covered cylinder with an opening facing toward an opposite axial side; a rotor magnet (23) held on an inside of a cylindrical portion (222) of the rotor holder (22); a stator (32) arranged radially inside the rotor magnet (23); and a circuit board (33) electrically connected with the stator (32), and arranged axially opposite the opening of the rotor holder (22). A cover portion (221) of the rotor holder (22) includes a through hole (223) passing therethrough in an axial direction, and a blade (224) defined integrally with the cover portion (221) and arranged to produce an air current passing from the opposite axial side toward the one axial side.