A circuit board assembly includes a first circuit board, a second circuit board having a first side extending adjacent to a first side of the first circuit board, and a metal fitting including a portion bent at the angle and spanning both the first side of the first circuit board and the first side of the second circuit board. The second circuit board is in a posture having an angle other than 180° to the first circuit board. The metal fitting is fixed to both the first circuit board and the second circuit board.