PROBLEM TO BE SOLVED: To provide a guide tube for endoscopes allowing an operator to observe with a sufficient and appropriate light quantity, and when oil or the like is stuck to an observation window or an illumination window provided on an endoscope insertion section, removing the fouling and providing a favorable endoscopic image of an observation object.SOLUTION: A guide tube 4 for endoscopes comprises: a tube body 30 that includes an illumination window 19 and an imaging window 18 at a distal end 15, an insertion section through-hole 31 that is connected to a proximal end side of the distal end 15, connects a bend section 16, and in which an endoscope insertion section 10 having a predetermined bending hardness is forward/backward movably inserted, and a bent section 34 configured to retain a predetermined curvature at a location at a predetermined distance spaced from a distal end surface 4f a squirt hole 74 of a nozzle 70 provided in the distal end side with respect to the bent section 34 and in an outer peripheral side of the insertion section through-hole 31 at a curvature center side of the bent section 34 for squirting fluid and a fluid hole 32 and a nozzle hole 42 for supplying the fluid to be squirted from the squirt hole.
