The device (10) has extra-corporal blood circulation components that are located inside and outside of casing (11). A base (20) is attached below the casing, and provided with collection trough (21) in which internal leaking liquids occurring within the casing is collected. A sensor (30) measures the liquid in collection trough. The receiving components (22) receive the external leaking liquids occurring outside of casing. The receiving components are formed so that external leaking liquid of specified quantity is passed into collection trough.
