Optical receptacle and optical module

An optical receptacle configured to be disposed between a photoelectric conversion element and an optical transmission member, and configured to optically couple the photoelectric conversion element with an end surface of the optical transmission member, the optical receptacle comprising:

• a first optical surface configured to allow incidence of first emission light emitted from the photoelectric conversion element, or to emit, toward the photoelectric conversion element, second emission light which has been emitted from the end surface of the optical transmission member and has passed through inside of the optical receptacle;
• a second optical surface configured to emit, toward the end surface of the optical transmission member, the first emission light which has entered the optical receptacle from the first optical surface and has passed through the inside of the optical receptacle, or to allow incidence of the second emission light emitted from the end surface of the optical transmission member;
• a first fitting part disposed in a first side surface which is neither a surface in which the first optical surface is formed nor a surface in which the second optical surface is formed;
• and
• a second fitting part disposed in a second side surface which is opposite to the first side surface with a light path of the first emission light or a light path of the second emission light therebetween, the second fitting part having a shape capable of being fitted to the first fitting part.