Optical receptacle and optical module

An optical receptacle for optically connecting a photoelectric conversion element with an end surface of an optical transmission member when the optical receptacle is disposed between the photoelectric conversion element and the optical transmission member, the optical receptacle comprising:

• a first part that is disposed on one side in a first direction and has an optical function for optically connecting the photoelectric conversion element with the end surface of the optical transmission member;
• a second part that is disposed on another side in the first direction and includes a gate mark or a gate remnant;
• a pair of side connection portions that connect the first part with the second part;
• a rib that is disposed between the pair of side connection portions and connects the first part with the second part;
• and
• a thin-wall portion that is disposed in a space surrounded by the first part, the second part, and the pair of side connection portions and has a thickness smaller than those of the pair of side connection portions and the rib, the space being a space in which the rib is not located,
• wherein
• the first part, the second part, the pair of side connection portions, the rib, and the thin-wall portion are integrally molded, and
• respective cross-sectional areas of the pair of side connection portions, the rib, and the thin-wall portion in a cross section in a direction orthogonal to the first direction are designed in such a way that a first weld line is formed on the thin-wall portion.