Abstract: Disclosed is a block toy having a plurality of coupling beads each having a plurality of insertion grooves on the outer peripheral surfaces thereof, a plurality of coupling bars connecting the plurality of coupling beads to form predetermined three dimensional frameworks, and a plurality of assembling plates covering the spaces among the predetermined three-dimensional frameworks to form a whole shape, characterized in that each of all outer peripheral surfaces of each of the plurality of coupling beads is made with 8 sides along vertical and horizontal directions of a radially outer periphery thereof from the center thereof, thereby allowing the plurality of coupling beads to have basic angles 45°, 60° and 90°. Thereby, the assembling work of the plurality of coupling beads, the plurality of coupling bars and the plurality of assembling plates can be carried out in simple and easy manners and a delicate and complicated structure can be built.