Front end component (1) includes transparent resin outer layer portion (2), forms and constitute the front end surface of insertion section (11) by the 1st transparent resin component； Internal structure portion (3) touches with the inner surface (2i) in transparent resin outer layer portion (2) and is arranged, and the 2nd resin component by being different from the 1st resin component is formed； Multiple hardware securing holes (30,40A, 40B, 50), they are set to internal structure portion (3), and the front end side end for configuring the component (9a, 5,6) of (11) in insertion section is arranged； And lens section (2a, 2b, 2c), they are set to transparent resin outer layer portion (2), because configure in insertion section (11) the illumination light department of the Chinese Academy of Sciences (5), observe optical section (6) front end side end be provided in light optics hole (40A, 40B), observation optics hole (50) in due to the illumination light department of the Chinese Academy of Sciences (5), observe optical section (6) front end face (5f, 6f) it is opposite disposed.先端部品１は、透明な第１樹脂部材で形成されて挿入部１１の先端部表面を構成する透明樹脂外層部２と、透明樹脂外層部２の内面２ｉに密着して設けられる第１樹脂部材とは異なる第２樹脂部材で形成される内部構造部３と、内部構造部３に設けられ、挿入部内１１に配置される部品９ａ、５、６の先端側端部が配設される複数の部品固定孔３０、４０Ａ、４０Ｂ、５０と、透明樹脂外層部２に設けられ、挿入部１１内に配置された照明光学部５、観察光学部６の先端側端部が照明光学用穴４０Ａ、４０Ｂ、観察光学用穴５０に配設されて該照明光学部５、観察光学部６の先端面５ｆ、６ｆに対向して設けられるレンズ部２ａ、２ｂ、２ｃと、を具備する。
