| 摘要 |
<p>A cap (10) of an endoscope (12) has an end part (84). On an inner periphery (85) of the end part (84), a reference mark (92) showing an ideal focus position and six marks (94A, 94B, 94C, 94D, 94E, 94F) are formed with regular intervals (P). When a circular end surface (84A) of the cap (10) is pressed against a mucous membrane (87), the mucous membrane (87) swells to the reference mark (92). Therefore, the mucous membrane (87) can be kept at the ideal focus position for an object optical system (40). <IMAGE></p> |
