An endoscope valve (122, 300, 400) comprising: a cylinder (140) having a groove (143) on a lateral surface of the cylinder (140)； a cylinder sleeve (170, 200, 370) that has a cylindrical shape and is inserted into an inner circumference of the cylinder (140)； a piston (160) that is inserted into an inner circumference of the sleeve (170, 200, 370) of the cylinder； a sleeve (180, 380, 480) having a rib (181, 381, 481) of a sleeve and a skirt (187, 387, 487) of a sleeve, the rib (181, 381, 481) of the sleeve covering at least part of an open end of the cylinder (140), the sleeve skirt (187, 387, 487) covering at least part of a circumferential surface of the open end； and the sleeve (170, 200, 370) of the cylinder having a rib (201, 372) projecting radially from a circumference of the sleeve (170, 200, 370) of the cylinder in an outer direction； characterized in that the sleeve (180, 380, 480) has a pin (182, 382, 482), the pin (182, 382, 482) protruding from the skirt (187, 387, 487) of sleeve towards the circumferential surface for engage with the groove (143)； the rib (181, 381, 481) of the sleeve holds the rib (201, 372) at the open end in the event that the pin (182, 382, 482) fits into the groove (143)； and an elastic body (232) is disposed between the sleeve rib (181, 381, 481) and the rib (201, 372), and a support (231) is disposed on a side surface of the sleeve (170, 200, 370) of the cylinder and the sleeve rib (181, 381, 481) is coupled, and the elastic body (232) deflects the rib (181, 381, 481) of the sleeve in a direction that is opposite the open end in order of coupling the rib (181, 381, 481) of the sleeve with the support (231).Una válvula de endoscopio (122, 300, 400) que comprende: un cilindro (140) que tiene una ranura (143) sobre una superficie lateral del cilindro (140)； una camisa (170, 200, 370) del cilindro que tiene una forma cilíndrica y se inserta en una circunferencia interior del cilindro (140)； un pistón (160) que se inserta en una circ
