FIG. 4 is a view illustrating a magnet angle θ_M and a blade angle θ_W of the brush motor 1. In the cross section perpendicular to the rotation axis C, a range where the magnetized region of one magnet magnetic pole 5 substantially covers the rotor 6 is expressed by an angle with respect to the rotation axis C, and this is referred to as the magnet angle θ_M. For example, in a case where the magnet 4 is divided into a plurality of magnet magnetic poles 5 (a plurality of magnet pieces) as illustrated in FIG. 4, a central angle of a fan shape surrounded by the magnet magnetic pole 5 and line segments connecting both ends of the magnet magnetic pole 5 to the rotation axis C in the cross section perpendicular to the rotation axis C is defined as the magnet angle θ_M. In addition, in a case where the magnet 4 is a ring magnet, a range in which a magnetic force appears in the radial direction without including a non-magnetized region is expressed by an angle with respect to the rotation axis C, and this range is defined as the magnet angle θ_M.