The present inventions provides a magnetizing apparatus 100 for magnetic particle testing of a wheel 7 that includes a hub 71, a plate 72, and a rim 73 in sequence from inward to outward in a radial direction of the wheel. The apparatus includes: a conductor 1 inserted through a bore 711 of the hub 71; and a pair of auxiliary conductors 2 connected to respective opposite end portions of the conductor 1, and so disposed as to face respective opposite side surfaces of the wheel 7, and to extend from the hub 71 to the rim 73 outwardly in a radial direction of the wheel 7, wherein the pair of auxiliary conductors 2 and the conductor 1 are energized with alternating current.