Abstract: A block for building is provided. The block may include a body, a case provided in the body, a holder movably provided within the case, and a magnet installed in the holder. The holder may include a sliding prevention part to provide for engagement with adjacent blocks together with the magnet. Adjacent blocks having such a construction may connect to each other to build a plurality of figures without movement of the blocks relative to each other.

Abstract: A block for building a toy is provided. The block includes a body, a case provided in the body, a holder with a sliding-prevention part, provided movably and rotatably within the case, and a magnet with south and north pole faces, installed in the holder. The blocks, each with this construction, can connect to each other to build a toy, without sliding off relative to each other.

Abstract: A magnetic block toy is provided that includes a plurality of magnetic blocks coupled to one another by magnets therein. Each of the magnetic blocks includes a body part having two or more end portions and a magnet-mounting part at each end portion of the body part adapted to mount magnets having different polarities on upper and lower surfaces thereof so as to be rotatably supported by a shaft formed on both sides of an outer periphery thereof. When one magnetic block approaches another magnetic block, the magnets are rotated to cause the magnetic blocks to be coupled to each other irrespective of a coupling direction. When the magnetic blocks are coupled to each other, they do not slide against or separate from each other.

Abstract: Provided is there a piece with a magnet for building a toy, and more particularly to a piece with a magnet for building a toy, the piece having at least two or more end and a magnet case having a magnet with south and north pole faces inside, rotatably provided on each end, capable of connecting to the other piece of the same construction, without sliding with respect to each other, by automatically enabling the north or south pole face of the one magnet to be opposite to the south or north pole face of the other magnet.