Photodetektor.

摘要

A photodetector (K1-K5) including a reception portion (1) and a shield casing (2) for performing electromagnetic shielding of the reception portion (1), in which a light receiving window (3) confronting the reception portion (1) is formed on the shield casing (2) convexly in a direction away from the reception portion (1) and a plurality of holes (4) for directing light signals (5) towards the reception portion (1) are formed on a peripheral surface of the light receiving window (3).