A copper frame plate (2) has a central frame plate (2a) and a pair of side frame plates (2c) bent from both ends of the central frame plate. A flexible substrate (3) has a central substrate (3a) covering the central frame plate and bent substrates (3b) bent from the central substrate so as to cover the side frame plates. An optical element (4) is mounted on the central frame plate. A plurality of internal wiring terminals (9) connected to the optical element are disposed on the central substrate and arranged in the width direction (W) along which the pair of side frame plates are opposed to each other. A plurality of external wiring terminals (11) used for connection to external equipment are disposed on the bent substrates and arranged in the length direction (L) orthogonal to the width direction.