The present invention relates to an assembly-type toy including: a toy main body; a toy main body connection means arranged in the toy main body, one side of which is inserted into another toy main body and the other side of which is provided to accommodate another toy main body; and a rotation support member which is arranged between the toy main body and the connection means and which is provided such that the connection means supports rotation from the one side to the other side. According to the present invention, a fastening part disposed in a toy block, one side of which accommodates the fastening part of another toy block and the other side of which is inserted into the fastening part of another toy block, is capable of interconnecting a plurality of toy blocks and is capable of relative rotation, and the fastening part that is not used for coupling is arranged inside the toy block so that a finally assembled toy can have a neat external appearance and be formed in a desired shape.