A method for fabricating a multi-piece board includes: preparing a board main portion having a first coupling member and multiple piece portions connected to the first coupling member, the first coupling member forming a part of a coupling member of a multi-piece board, each of the piece portions having a printed wiring board; preparing a second coupling member which forms the coupling member together with the first coupling member; and adhering the second coupling member to the first coupling member of the board main portion, thereby yielding the multi-piece board.