Patent ID: 8038606

Claim:
An endoscope insertion portion comprising: a distal end portion disposed at a distal end part; a bending portion bendable in an up/down direction in accordance with a monitor screen on which an endoscope image is displayed, the bending portion being provided in a linked manner on a proximal end side of the distal end portion; a first observation optical system for making light from a subject incident on a first image pickup portion, the first observation optical system being provided in the distal end portion; a second observation optical system for making light from the subject incident on a second image pickup portion, the second observation optical system being provided in the distal end portion; an air/water feeding portion for spouting gas or liquid from a spouting port to outer surfaces of the first observation optical system and the second observation optical system, the air/water feeding portion being disposed on an upper side in the up/down direction with respect to a horizontal line passing through a center of a distal end surface of the distal end portion so as to line up with the first observation optical system and the second observation optical system on a generally straight line; a first duct for inserting a treatment instrument therein and for suction, the first duct having an aperture portion which is disposed to be positioned on a lower side in the up/down direction with respect to the horizontal line on the distal end surface in contrast with the air/water feeding portion; and a second duct for spouting liquid to a diseased part in a body cavity, wherein the spouting port of the air/water feeding portion defines a spouting direction of the gas or the liquid spouted from the spouting port such that the spouting direction has a first angle for spouting the gas or the liquid toward the lower side with respect to the up/down direction and a second angle for spouting the gas or the liquid toward the upper side with respect to a line linking respective centers of the first observation optical system and the second observation optical system, and an aperture portion of the second duct is disposed on the distal end portion so as to be positioned outside of the spouting area of the gas or liquid from the spouting port.