To provide a tip part of an endoscope in which the water drops attached on the surface of lens can be easily removed outside the field of observation, and capable obtaining a good observational image.

A hydrophilic painting or a hydrophilic coating A is applied to the part other than an optical effective diameter 11a on the surface of a first optical object lens 11 fitted to an observational window 3 or to the surface of the circumference of the observational window 3 of the tip end body 1.