The present invention is a blood pump purge fluid circulation device in which the sliding performance of the sliding device is higher than that of a conventional blood pump. The first sliding surface of the fixed side sliding member and the second sliding surface of the rotating side sliding member are opposed to each other, and each outer peripheral side of the fixed side sliding member and the rotating side sliding member is blood. A sliding device (1) used in contact with the liquid, a purge liquid circulation unit (210) for circulating the purge liquid to the stationary-side sliding member and the rotating-side sliding member, and a configuration for circulating the purge liquid A purge liquid circulation device (200) of a blood pump including a purge liquid circulation path (420), and the purge liquid circulation unit (210) provides a purge liquid circulation pump (212) that gives a moving force to the purge liquid And a flow rate adjustment valve (214) capable of adjusting the flow rate of the purge liquid when returning to the purge liquid storage section through the inner peripheral sides of the fixed side slide member and the rotation side slide member.本発明は、血液ポンプのパージ液循環装置において、従来の血液ポンプよりも摺動装置のシール性能を高くしたものである。固定側摺動部材の第１摺動面と回転側摺動部材の第２摺動面とを対向させた状態で、かつ、固定側摺動部材及び回転側摺動部材の各外周側を血液に接触させた状態で使用する摺動装置（１）と、パージ液を固定側摺動部材及び回転側摺動部材に循環させるパージ液循環ユニット（２１０）と、パージ液を循環させるように構成されているパージ液循環経路（４２０）とを備える血液ポンプのパージ液循環装置（２００）であって、パージ液循環ユニット（２１０）は、パージ液に移動力を与えるパージ液循環ポンプ（２１２）と、固定側摺動部材及び前記回転側摺動部材の各内周側を通ってパージ液貯留部に戻るときの当該パージ液の流量調整が可能な流量調整バルブ（２１４）とを有する。
