An endoscope sheath includes: a sheath body through which an endoscope channel is formed； a projecting portion extending in the longitudinal direction from the distal end of the sheath body and provided at a portion in the circumferential direction, on the radially outer side the endoscope channel； a nozzle from which the cleaning fluid is jetted radially inward of the sheath body and that is provided at the distal end portion of the projecting portion； and a fluid channel through which the cleaning fluid is supplied to the nozzle. At the distal end of the sheath body, the side opposite the nozzle with the endoscope channel therebetween in the radial direction is open.
