LIQUID SUCTION DEVICE

Only a supernatant in a centrifugal separation container is drawn out and removed as much as possible. The present disclosure relates to a liquid suction device 1 including container holding means 3 that holds a centrifugal separation container 2 in which a mouth portion 2d is formed at an upper portion, and a tubular main housing portion 2a and a conical bottom housing portion 2b below the main housing portion 2a are formed inside, with the bottom housing portion 2b facing down; a cylindrical suction nozzle N that is inserted into the centrifugal separation container 2; and suction means 8 to which the suction nozzle N is connected to draw out a liquid in the centrifugal separation container 2. Container inclining means 4 that inclines the container holding means 3, and nozzle inserting means 6 that inserts the suction nozzle N into an inside of the centrifugal separation container 2 are included, the container inclining means 4 inclines the container holding means 3 so that a boundary portion 2c between the main housing portion 2a and the bottom housing portion 2b in an inner peripheral surface of the centrifugal separation container 2 is at a lowermost end position, and a supernatant L is drawn out by the suction means in a state in which a tip end of the suction nozzle N is positioned at the boundary portion 2c at the lowermost end position.