| 摘要 |
PROBLEM TO BE SOLVED: To guide the objective lens of a hard mirror to the desired position of the dead angle portion of a microscope observation easily and reliably by easily correlating the observation position of the hard mirror with the microscope visual field. SOLUTION: This hard mirror 4 is provided with an objective optical system having an observation optical axis O3 at a different angle against the inserting direction near the tip section 16 of an insertion section 5 inserted into a body cavity. A line index 18 serving as an identification means showing the direction of the observation optical axis O3 in the plane perpendicular to the inserting direction is provided near the tip section 16 of the insertion section 5. |
