A house-building toy comprises element blocks that include floor foundation blocks (2) functioning as the foundation of a house model and structuring a floor portion of the house model, wall blocks (3) structuring a wall portion of the house model, roof blocks (4) structuring a roof portion of the house model, and floor panel blocks (5) structuring on the floor foundation blocks (2) the ground and a floor surface in the house. Hole portions communicating with the element blocks are formed at joints between the floor foundation blocks (2) and the wall blocks (3) and at joints between the floor foundation blocks (2) and the roof blocks (4). Wires (W) for supplying electricity, for example, for lighting are laid from the outside to the inside of the house model.