Patent ID: 7320633

Claim:
A built-up type toy having a plurality of parts of polyhedron shape, each part of the plurality of parts equipped with joining surfaces configured to be joined with joining surfaces of other parts of the plurality of parts, the built-up type toy comprising: the plurality of parts, each part of the plurality of parts comprising a magnet portion on each of the joining surfaces thereof, the magnet portion operable to be joined by magnet force thereof with a second magnet portion of a second joining surface of the joining surfaces of the other parts of the plurality of parts; the magnet portion comprising: a magnet, each magnetic pole of the magnet being arranged to face a direction different from the other magnetic pole of the magnet, the magnet being installed at a magnet installation recess formed on the part; and a separation preventing device structured to prevent separation of the magnet from the magnet installation recess while allowing a rotation of the magnet in an inner space of the magnet installation recess, wherein the separation preventing device is a magnet installation member inserted into the magnet installation recess, the magnet installation member comprising: a circumferential portion, a surface of which is in contact with the magnet installation recess; and a lid portion positioned between the magnet and an outside of the part, the lid configured to close an upper opening of the magnet installation member, wherein the magnet installation member has a shape of a cylinder of which a bottom side is open.