The optical transmission module 1 includes an optical fiber 40, a light emitting element 10, a holding member 30 having a through hole H30 into which the optical fiber 40 is inserted, and a holding member 30 bonded to the first main surface 20SA. Sealing which seals the junction part of the wiring board 20 with which the joining electrode 21 arrange positioned by 20SB of main surfaces and the external electrode 12 of the light emitting element 10 are joined, and the external electrode 12 and the joining electrode 21 And an intermediate member 50 having an upper surface in contact with the distal end surface of the optical fiber 40 and a lower surface in contact with the light emitting portion 11 of the light emitting element 10.光伝送モジュール１は、光ファイバ４０と、発光素子１０と、光ファイバ４０が挿入されている貫通孔Ｈ３０のある保持部材３０と、第１の主面２０ＳＡに保持部材３０が接着され第２の主面２０ＳＢに配設されている接合電極２１と発光素子１０の外部電極１２とが接合されている配線板２０と、外部電極１２と接合電極２１との接合部を封止している封止樹脂６０と、を具備し、上面が光ファイバ４０の先端面と当接し、下面が発光素子１０の発光部１１と当接している、中間部材５０をさらに具備する。
