Optical transmission moduleOptical element 10 andAn optical fiber 20 which is a reflective surface 20sa having an end surface inclinedA retaining member 40 having an end portion of the optical fiber 20 embedded thereinAn optical element 10 is mounted on the first main surface 50sa, and the holding member 40 is adhered to the second main surface 50sb, and a wiring board 50 having a through hole H50 serving as an optical path is formed.AndThe holding member 40 is made of transparent resin.The bottom surface 40sa of the holding member 40 abuts against the second main surface 50sb of the wiring boardThe angle. Theta. Of the reflecting surface 20sa with respect to the main surface 10sa of the optical element 10 is fixed at an angle at which light transmitted through the optical fiber 20 is coupled to the optical element 10.光伝送モジュール１は、光素子１０と、端面が傾斜している反射面２０ＳＡである光ファイバ２０と、光ファイバ２０の端部が埋め込まれている保持部材４０と、第１の主面５０ＳＡに光素子１０が実装されており第２の主面５０ＳＢに保持部材４０が接着されており光路となる貫通孔Ｈ５０が形成されている配線板５０と、を具備し、保持部材４０が透明樹脂からなり、保持部材４０の底面４０ＳＡが配線板５０の第２の主面５０ＳＢと当接し、反射面２０ＳＡの光素子１０の主面１０ＳＡに対する角度θが光ファイバ２０を導光される光が光素子１０と光結合する角度に固定されている。
