To provide a medical device that achieves ease of operation at its operation input unit and patient's safety simultaneously. Means of achieving the object <；??>；A medical device comprising an operation input unit 12 for an operator to enter instructions and a operation unit for performing prescribed operations required for medical treatment based on input from said operation input unit 12, consisting of a dialysis device that purifies patient's blood by means of extracorporeal circulation, further comprising a human body detection means 18 for detecting the operator's presence in the vicinity of operation input unit 12, and a control unit 19 that provides control for allowing input operation unit 12 to instruct the operation unit's operations, or allowing the operation unit to operate based on the input entered into operation input unit 12, only when said human body detection means 18 is detecting the operator. <；IMAGE>；
