Optical transport module (1) includes light-emitting component (50), sends the first optical signal； Light receiving element receives the second optical signal； Optical fiber (70) is guided third optical signal obtained from first optical signal and the second optical signal multiplex； And optical waveguide substrate (20), it has the optical waveguide (23) being made of the first resin, optical fiber (70) and prism (30) are equipped in the slot (22) being formed on optical waveguide substrate (20), the prism (30) has the reflecting surface (30M) for penetrating first optical signal, the first side (30S1) of the prism (30) is abutted with the first wall surface (22S1) of the slot (22), and second side (30S2) is abutted with the second wall surface (22S2) of the slot (22).光伝送モジュール１は、第１の光信号を送信する発光素子５０と、第２の光信号を受信する受光素子と、前記第１の光信号と前記第２の光信号とが合波された第３の光信号を導光する光ファイバ７０と、第１の樹脂からなる光導波路２３を有する光導波路基板２０と、を具備し、光導波路基板２０に形成された溝２２に、光ファイバ７０および前記第１の光信号が透過する反射面３０Ｍを有するプリズム３０が配設されており、前記プリズム３０の第１の側面３０Ｓ１が、前記溝２２の第１の壁面２２Ｓ１と当接しており、第２の側面３０Ｓ２が前記溝２２の第２の壁面２２Ｓ２と当接している。
