Patent ID: 8100735

Claim:
A built-up type toy having a plurality of parts of polyhedron shape equipped with joining surfaces that are joined with other joining surfaces of other parts, the built-up type toy comprising: the parts respectively having magnet portions on the joining surfaces thereof; wherein the magnet portion of each part and the magnet portion on the joining surface of other parts are joined with each other by magnetic force thereof, and wherein the magnet portion comprises: a magnet of which both magnetic poles are arranged to face directions different from each other, the magnet being installed on a magnet installation recess formed on the part; and a separation preventing means for preventing a separation of the magnet from the magnet installation recess while allowing a rotation of the magnet in the inner space of the magnet installation recess, wherein the separation preventing means is a sealing lid for closing the opening of the magnet installation recess, wherein the magnet installation recess and the sealing lid are formed integrally on the outer surface of the part, the magnet is inserted after cutting the part, and the separation preventing means comprises a plurality of cut pieces attached on the part, wherein the plurality of cut pieces have shapes identical to each other.