To provide an LED-type tip optical adapter which improves observation performance and assembling workability while preventing electrical short-circuiting caused by the entry of water into an illuminating boardAn LED type tip optical adapter includes a light emitting element for emitting illumination light, a mounting surface having a through hole and having a light emitting element mounted thereon, a wall surface portion projecting from the mounting surface, 7d and 7e and a small diameter hole 6a in which the outer peripheral surface of the first wall surface portion 7d of the three-dimensional molded substrate 7 is arranged, and the outer peripheral surface of the first wall surface portion 7d and the small diameter hole 6a An adapter frame member 6 that forms a first adhesive filling space S1 for filling the adhesive 22 between the inner peripheral surface of the second wall surface portion 7e and the inner peripheral surface of the second wall surface portion 7e, And a lens holding frame 8 for forming a second adhesive filled space S2 for filling the adhesive 22 between the inner peripheral surface of the hole 7h and the lens holding frame 8.(Fig.【課題】水が照明基板まで浸入することによって発生する電気的ショートを防止しつつ観察性能及び組立作業性の向上を図ったLED式先端光学アダプタを提供する【解決手段】LED式先端光学アダプタ5は、照明光を出射する発光素子10と、貫通孔7hを有し、発光素子10を実装する実装面7c、実装面7cから突出して設けられた壁面部7d、7eを備える立体成形基板7と、立体成形基板7の第1の壁面部7dの外周面が配置される小径孔6aを有し、第1の壁面部7dの外周面と小径孔6aの内周面との間に接着剤22を充填するための第1接着剤充填空間S1を形成するアダプタ枠部材6と、貫通孔7hに配置され、第2の壁面部7eの内周面と貫通孔7hの内周面との間に接着剤22を充填するための第2接着剤充填空間S2を形成するレンズ保持枠8と、を具備する。【選択図】図6E
