To provide a magnetizing method and device for a permanent magnet type motor, capable of magnetizing an unmagnetized magnetic member by accurately performing positional matching of a rotor with a stator with a small-sized device even if a compressor has a structure that its inside part is invisible.

This method includes a first measuring step for measuring inductance of windings by applying rotor position detection voltage between a first phase winding and a second phase winding among three phase windings, while changing a rotator position; a second measurement step for measuring inductance by applying the rotor position detection voltage between the first phase winding and a third phase winding, while changing the rotator position; a magnetization reference position determining step of determining the position of the rotator relative to the stator as a magnetization reference position, when a majored value by the first measuring step and a majored value by the second measuring step practically becomes the same; and a magnetization step for rotating the rotor by a prescribed angle including 0 degree from the magnetization reference position and magnetizing the unmagnetized magnetic member of the rotor, by applying a current to the winding of a prescribed phase of stator.