Light detecting device and method for mounting the same

A method for surface-mounting a light detecting device on a circuit board, the light detecting device comprising:

• a light receiving element comprising a semiconductor layer for detecting light, a first electrode connected electrically to the semiconductor layer, and a transparent substrate on which the semiconductor layer and the first electrode are provided;
• an insulating substrate on which the light receiving element is arranged;
• a second electrode provided so as to be exposed at a first face and a second face of the insulating substrate;
• a protective layer provided between the light receiving element and the insulating substrate;
• and
• a light shielding layer on an end face of the transparent substrate,
• wherein the light receiving element is arranged on the first face of the insulating substrate, the first electrode is electrically connected to the second electrode which is exposed at the first face of the insulating substrate, and the light detecting device is surface-mounted on the circuit board in such a manner that the second electrode exposed at the second face of the insulating substrate is connected to an external terminal of the circuit board.