The present invention is a blood purifier that comprises: a squeeze pump that includes a stator to which a pump tube having a first portion and a second portion is removably mounted, and a rotor which rotates about a predetermined axis and has a roller that squeezes the pump tube mounted on the stator to deliver a liquid and a guide portion that holds the pump tube at a suitable position for squeezing the pump tube with the roller； a locking member that locks an attachment member to which the pump tube is attached； and a displacing part that displaces the attachment member locked by the locking member between a set position and a non-set position by moving the locking member. The blood purifier is in an attachable state in which the first portion of the pump tube is disposed in the suitable position by the locking member moving from the non-set position to the set position with the guide portion of the squeeze pump stopped at a specific phase. Loading is performed in which the guide portion rolls the pump tube into the stator so that the first portion and the second portion of the pump tube are disposed at the suitable position, by driving the squeeze pump in the attachable state and rotating the rotor by a predetermined angle.La présente invention concerne un purificateur de sang qui comprend : une pompe péristaltique qui comprend un stator sur lequel est monté de manière amovible un tuyau de pompe ayant une première partie et une seconde partie, et un rotor qui tourne autour d'un axe prédéterminé et a un rouleau qui presse le tuyau de pompe monté sur le stator pour distribuer un liquide et une partie de guidage qui maintient le tuyau de pompe à une position appropriée pour presser le tuyau de pompe avec le rouleau ； un élément de verrouillage qui verrouille un élément de fixation sur lequel le tuyau de pompe est fixé ； et une partie de déplacement qui déplace l'élément de fixation verrouillé par l'élément de verrouillage entre une position définie et une position
