To provide a part attracting magnet unit capable of properly adjusting a position of a plurality of magnets.

A storage recessed part 36 is arranged in a holding member 35, and a plurality of magnet pieces 30, 31 and 32 are stored in this holding recessed part 36 in a movable state, and the plurality of magnets are fixed to a predetermined position in the holding recessed part 36. Thus, the number of magnets and a relative position of the magnets to a part 1 cab be properly set. A magnet unit 53 can be easily installed by arranging the holding member 35 attached with the magnets in a predetermined place.