A reluctance motor (100, 100A, 100B, 100C) for a compressor, the motor comprising: a rotor (3, 3A, 3B) having a rotor core that has an annular outer circumference about an axis, having a plurality of magnetic poles along the outer circumference, and having no permanent magnet; and a stator (1, 1C) having a stator core that surrounds the rotor (3, 3A, 3B) from an outer side in a radial direction about the axis and a winding wound around the stator core in wave winding, wherein each of the plurality of magnetic poles has a first slit (31, 51) formed in the rotor core and a second slit (32, 52) formed on an inner side of the first slit (31, 51) in the radial direction, and wherein a cutout part is provided on an outer circumference of the stator core, the cutout part constituting a refrigerant passage through which refrigerant passes in a direction of the axis, wherein the rotor core has a shaft hole formed at a center in the radial direction, characterized in that the rotor core has groove parts each of which extends in the radial direction from the shaft hole toward a center of the second slit (32, 52) in a circumferential direction about the axis, the rotor core further has a crimping part between two of the second slits (32, 52) adjacent to each other, and a through hole between two of the groove parts adjacent to each other, the number of the groove parts is equal to the number of the plurality of magnetic poles, the groove parts constitute refrigerant passages through which refrigerant is able to pass, and the through hole is a rivet hole or a through hole through which refrigerant is able to pass in the axial direction. a rotor (3, 3A, 3B) having a rotor core that has an annular outer circumference about an axis, having a plurality of magnetic poles along the outer circumference, and having no permanent magnet; and a stator (1, 1C) having a stator core that surrounds the rotor (3, 3A, 3B) from an outer side in a radial direction about the axis and a winding wound around the stator core in wave winding, wherein each of the plurality of magnetic poles has a first slit (31, 51) formed in the rotor core and a second slit (32, 52) formed on an inner side of the first slit (31, 51) in the radial direction, and wherein a cutout part is provided on an outer circumference of the stator core, the cutout part constituting a refrigerant passage through which refrigerant passes in a direction of the axis, wherein the rotor core has a shaft hole formed at a center in the radial direction, characterized in that the rotor core has groove parts each of which extends in the radial direction from the shaft hole toward a center of the second slit (32, 52) in a circumferential direction about the axis, the rotor core further has a crimping part between two of the second slits (32, 52) adjacent to each other, and a through hole between two of the groove parts adjacent to each other, the number of the groove parts is equal to the number of the plurality of magnetic poles, the groove parts constitute refrigerant passages through which refrigerant is able to pass, and the through hole is a rivet hole or a through hole through which refrigerant is able to pass in the axial direction.