PROBLEM TO BE SOLVED: To provide a blood purification device and a blood purification system capable of performing an operation for performing blood purification treatment on the basis of a step signal, or an operation related to the blood purification treatment when blood purification treatment is performed, and capable of preventing filling or circulation of a dialysate in a pipe when the blood purification treatment is not performed.SOLUTION: A blood purification device comprises: control means 13 for causing the device to perform an operation for performing blood purification treatment, or an operation related to the blood purification treatment on the basis of a received step signal and a pipe in which a dialysate is filled or circulated, for allowing the blood purification treatment when the step signal relates to a liquid substitution step and a treatment step. The control means 13 shifts the blood purification device to a standby state in which clean water is filled in the pipe, or a stop state in which power supply is cut off, when the blood purification treatment is not performed, and when the step signal relates to the liquid substitution step and the treatment step.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2017,JPO&INPIT【課題】血液浄化治療が行われる場合、工程信号に基づいて血液浄化治療を行うための動作又は当該血液浄化治療に関連する動作が可能とされるとともに、血液浄化治療が行われない場合、配管内の透析液の充填又は流通を防止することができる血液浄化装置及び血液浄化システムを提供する。【解決手段】受信した工程信号に基づいて、血液浄化治療を行うための動作又は当該血液浄化治療に関連する動作を行わせる制御手段13と、工程信号が液置換工程及び治療工程のとき、透析液を充填又は流通させて血液浄化治療を可能とする配管とを具備した血液浄化装置において、制御手段13は、血液浄化治療が行われない場合、工程信号が液置換工程及び治療工程のとき、配管に清浄水を充填させた待機状態とする、又は電力供給を遮断させた停止状態とするものである。【選択図】図5