To improve an insertion performance of the insertion section in an endoscope by miniaturizing the objective optical system.
A unit 31 of object lenses is composed of a plurality of lenses 32a, 32b, 33a, 33b, and frame bodies of approximately cylindrical shape of a first and a second lens frames 34, 35. A rear end side of expandedly provided section 34a of the first lens frame 34 is provided with a pair of projected portions 34b and a pair of recessed portions 34c, and a front end side of expandedly provided section 35a of the second lens frame 35 is provided with a pair of projected portions 35b and a pair of recessed portions 35c. The projected portions 34b and 35b are fittingly coupled with the recessed portions 35c and 34c respectively, and the projected portions 34b and 35b are formed fittingly to the lenses 33a and 32b respectively.
YAMATANI TAKATSUGU
FUJIMORI NORIYUKI
KAWACHI MASAHIRO
YABE HISAO
TAKAMURA KOJI
