Optical receptacle and optical module

An optical receptacle configured to be disposed between a photoelectric conversion device including a light-emitting element and a light-receiving element which are disposed on a substrate, and a plurality of optical transmission members, the optical receptacle being configured to optically couple the light-emitting element and the light-receiving element to respective end surfaces of the plurality of optical transmission members, the optical receptacle comprising:

• a first optical receptacle for transmission disposed on the substrate in such a manner that the first optical receptacle is opposite to the light-emitting element, the first optical receptacle including a first fitting part disposed in a first side surface that is not a surface opposite to the substrate;
• and
• a second optical receptacle for reception disposed on the substrate in such a manner that the second optical receptacle is opposite to the light-receiving element, the second optical receptacle including a second fitting part disposed in a second side surface that is not a surface opposite to the substrate, the second fitting part being configured to be fitted with the first fitting part,
• wherein a ratio of an intensity of emission light emitted from the first optical receptacle to an intensity of incident light incident on the first optical receptacle is smaller than a ratio of an intensity of emission light emitted from the second optical receptacle to an intensity of incident light incident on the second optical receptacle.