According to one embodiment, a circuit board is provided with a first rectangular electronic component, a board and a reinforcing plate. The first electronic component has a plurality of connection terminals. The board has the first electronic component mounted thereon via the connection terminals, and has a through hole for receiving a second electronic component at a position at which the first electronic component overlaps with the second electronic component. The reinforcing plate is attached to the back surface of the board, and has a plurality of first portions near the corner portions of the first electronic component, and a second portion of a strip shape coupling the first portions and located near the hole. The first and second portions are formed integral as one body.