Provided is an insertion-device cleaning implement which is sanitary, highly convenient, and capable of achieving excellent cleaning performance without adding special equipment to the insertion-device side, even with respect to insertion devices having complex structures. The cleaning implement is provided with: a cleaning-implement main body to which a tip component of an insertion device is attached a three-way stopcock which communicates with both a first cleaning port and a second cleaning port for ejecting a cleaning liquid towards different positions inside an accommodation chamber in the tip component, switches the communication direction, and adjusts the liquid supply amount a liquid-supplying function comprising a syringe for supplying the cleaning liquid, and a syringe coupling part provided with a check valve and a movement restriction part for positioning the tip component in a position in which the cleaning liquid is directly ejected from the first cleaning port and the second cleaning port, towards a rocking base that sways the travel direction in which a treatment implement extends, said rocking base being provided inside the accommodation chamber.Linvention concerne un outil de nettoyage dun dispositif dinsertion qui est hygiénique, hautement pratique, et capable dobtenir une excellente performance de nettoyage sans lajout déquipement spécial à côté du dispositif dinsertion, même par rapport à des dispositifs dinsertion ayant des structures complexes. Loutil de nettoyage est pourvu : dun corps principal doutil de nettoyage auquel un composant de pointe dun dispositif dinsertion est fixé un robinet darrêt à trois voies qui communique à la fois avec un premier orifice de nettoyage et un second orifice de nettoyage pour éjecter un liquide de nettoyage vers différentes positions à lintérieur dune chambre de logement dans le composant de pointe, commute la direction de communication, et ajuste la quantité de fourniture de liquide une fonction de fournitu
