Patent ID: 7885496

Claim:
A light receiving apparatus, comprising: a light receiving section including a light receiving element; a transparent part having a front face which is a first face to which signal light is incident and a second face extending perpendicularly to said first face and having a groove formed thereon; and a light guiding part inserted in said groove; said groove having a bottom face formed as an inclined face having a depth which increases toward the front face side; said groove further having, on the front face side, a side face formed as an arcuately curved face convex toward the front face side and having the same shape in any cross section perpendicular to the front face and also to the depthwise direction of said groove; said light guiding part having a face opposing to the bottom face of said groove, formed as an inclined face having a depth which increases toward the front side face in a state in which said light guiding part is inserted in said groove; said light guiding part further having a side face opposing to the side face of said groove on the front face side and formed as an arcuately curved face which is convex toward the front face side in a state wherein said light guiding part is inserted in said groove and which has the same shape in any cross section perpendicular to the front face and also to the depthwise direction of said groove.