An endoscope having an insertion portion which is to be inserted into an examined body, comprising: a first image pick-up portion provided at a distal end portion of the insertion portion for performing observation of a subject under a first condition, the first image pick-up portion having a first objective optical member and a first solid-state image pick-up device arranged at a position to form image of the first objective optical member; a second image pick-up portion provided at the distal end portion of the insertion portion for performing observation of the subject under a second condition, the second image pick-up portion having a second objective optical member and a second solid-state image pick-up device arranged at a position to form image of the second objective optical member; a switching device for switching between an observation image of the subject picked up by the first image pick-up portion to be displayed on display means and an observation image of the subject picked up by the second image pick-up portion to be displayed on the display means; a nozzle arranged such as to be able to discharge fluid to the first objective optical member and the second objective optical member; two illumination optical members (25a, 25b), each illumination optical member (25a, 25b) being connected to a light guide so as to output illumination light to the distal end portion of the insertion portion; and a treatment tool channel which permits the projection of a treatment tool from an opening arranged to the distal end portion of the insertion portion; characterized in that the tips of the light guides are fixed to the inside of illumination windows of a tip structuring member forming the distal end portion and the illumination optical members (25a, 25b) are attached right in front of the light guides, wherein the distal end portion presents a tip cover on which the nozzle is mounted, the tip cover presenting: an inclined portion arranged between the nozzle and the first objective optical member on the tip cover; a low portion on the side of the nozzle; and a high portion on the side of the first objective optical member via the inclined portion, wherein said inclined portion reaches the edge of the channel tip opening which is arranged near a bottom side of the nozzle and the first objective optical member. a first image pick-up portion provided at a distal end portion of the insertion portion for performing observation of a subject under a first condition, the first image pick-up portion having a first objective optical member and a first solid-state image pick-up device arranged at a position to form image of the first objective optical member; a second image pick-up portion provided at the distal end portion of the insertion portion for performing observation of the subject under a second condition, the second image pick-up portion having a second objective optical member and a second solid-state image pick-up device arranged at a position to form image of the second objective optical member; a switching device for switching between an observation image of the subject picked up by the first image pick-up portion to be displayed on display means and an observation image of the subject picked up by the second image pick-up portion to be displayed on the display means; a nozzle arranged such as to be able to discharge fluid to the first objective optical member and the second objective optical member; two illumination optical members (25a, 25b), each illumination optical member (25a, 25b) being connected to a light guide so as to output illumination light to the distal end portion of the insertion portion; and a treatment tool channel which permits the projection of a treatment tool from an opening arranged to the distal end portion of the insertion portion; the tips of the light guides are fixed to the inside of illumination windows of a tip structuring member forming the distal end portion and the illumination optical members (25a, 25b) are attached right in front of the light guides, wherein the distal end portion presents a tip cover on which the nozzle is mounted, the tip cover presenting: an inclined portion arranged between the nozzle and the first objective optical member on the tip cover; a low portion on the side of the nozzle; and a high portion on the side of the first objective optical member via the inclined portion, wherein said inclined portion reaches the edge of the channel tip opening which is arranged near a bottom side of the nozzle and the first objective optical member. an inclined portion arranged between the nozzle and the first objective optical member on the tip cover; a low portion on the side of the nozzle; and a high portion on the side of the first objective optical member via the inclined portion, wherein said inclined portion reaches the edge of the channel tip opening which is arranged near a bottom side of the nozzle and the first objective optical member.