An air-supplying/water-supplying nozzle (34) for delivering fluid to a second imaging unit (30) for observing a body to be examined which is provided at a distal end portion of an insertion portion (11) to be inserted into a body to be examined in a projecting manner is provided on a non-projecting face of the insertion portion (11), the non-projecting portion being disposed at a position lower than a flat face (26a) of a middle step portion (26) on which the second imaging unit (30) is disposed. Thereby, such a possibility can be reduced that an opening portion of the air-supplying/water-supplying nozzle (34) is caught by an object to be examined and observation or diagnosis work conducted using an observation optical system of an object-contacting type can be conducted.
