PROBLEM TO BE SOLVED: To provide an attachment member capable of smoothly performing an attaching operation and a detaching operation of a pump tube with respect to an ironing type pump regardless of deformation of the pump tube. SOLUTION: An attachment member is attached to a blood purification apparatus having an ironing type pump and holds a pump tube C which can be squeezed in a predetermined direction by the ironing type pump and can deliver liquid, and can be attached to a predetermined position of the blood purification apparatus. The main body 2 and the holding portion 3 that is attached to the main body and holds the pump tube are provided, and the holding portion holds the pump tube while inclining the pump tube toward the mounting direction of the pump tube to the ironing pump. It is characterized by [Selection diagram] Fig. 13
