Tip with has a lens frame 31, the objective lens 40, an aperture plate 18, the distal end surface 32s an abutting portion 32 which stepped portion D is formed between the surface 31fs and the distal end surface 32s, it comprises a are space 39 accumulate the adhesive behind the stop plate 18 is formed, the adhesive reservoir space 39 of the adhesive A, the rear end face 18k of the stop plate 18 is fixed to the distal end surface 31fs and abutting portion 32 of the flange 31f.レンズ枠31と、対物レンズ40と、絞り板18と、先端面32sを有するとともに先端面31fsと先端面32sとの間に段部Dが形成された突き当て部32と、を具備し、絞り板18の後方に接着剤溜まり空間39が形成されており、接着剤溜まり空間39内の接着剤Aにより、絞り板18の後端面18kは、フランジ31fの先端面31fs及び突き当て部32に固定されている。
