In an endoscope that includes an observing section (28, 228) observing a body to be examined in a contacting state with or in a proximal state to a flat face (25a, 225a) of a projecting step section (25, 225) at a distal end of an insertion section (11) to be inserted into the body to be examined, a guide groove (36) for guiding fluid caused to flow from a pipe conduit opening section (30a) for fluid supply which supplies fluid to the flat face (25a, 225a) of the projecting step section (25, 225) in a direction of a first lens (118b1) of an observation optical system (115) which is an observation window of the observing section (28, 228) is provided.
