An endoscope apparatus (100) includes a forceps port (33) through which a treatment instrument (27) is inserted, an observation window (37) for observing an object and an illumination window (45) which are arranged on a distal-end surface (35) of an endoscope insertion portion (13) having a bendable part (17). An opening circumferential-edge (39) of the forceps port (33) is arranged to protrude from an axially distal-end of the endoscope insertion portion (13). The distal-end surface (35) between the opening circumferential-edge (39) and an edge of an outer circumferential surface (41) of the endoscope insertion portion (13) is a sloping surface to form an end of the endoscope having a taper shape so as to protrude the opening circumferential-edge (39). Preferably, the observation window (37) is arranged at a position such that a part of the opening circumferential-edge (39) of the forceps port (33) is within an observation view field (73) of the observation window (37).
