| 摘要 |
This endoscope 1 includes an observation optical system (3) capable of changing a magnified observation and a normal observation with each other, and a plurality of illumination optical systems (4), wherein a most tip side lens surface (4e) of at least one of the illumination optical systems (4) is disposed at a position which is closer to a proximal end side than a most tip side lens surface (3e) of the observation optical system (3), and the following conditional expressions are satisfied. 0.03 < D_Back max / ft < 2 1.05 < ft / fw < 5 In the expression, D_Back(max) is a maximum value of a distance between the most tip side lens surface (4e) and the most tip side lens surface (3e), ft is a focal length in a close-distance magnified observation state, and fw is a focal length in a normal observation state. |
