An optical receptacle is capable of actualizing, at low cost, optical transmission accompanying monitoring in which light of a light-emitting element is extracted in a direction along a substrate at an optical transmission body. In an embodiment, light of a light-emitting element 7 that has been incident on a first surface 2a (11) is separated into coupling light and monitor light using total reflection at a coupling light total reflection surface 14 and a first monitor light total reflection surface 15. The coupling light is emitted towards an optical transmission body 5 from a third surface 2c (12), and the monitor light is emitted towards a light-receiving element 8 from the first surface 2a (13).