To positively release the absorbed state when the absorption between a movable valve and a valve seat before a change continues even after the normal standing/reversing change, in a normal standing/reversing pump mechanism using respective movable valves for normal standing/reversing.

An intra-cylinder upstream side housing space region 22 of which the capacity changes in response to the movement of a piston 4 is installed in a space between flowing-in passage selection operating sections 10 and 11, and upstream valve operating sections 3a and 8. Then, at the time of a discharging operation, a content in the upstream side housing space region is made to flow in the reverse direction (B direction) by the flowing-in passage selection operating sections. Also, accompanying the change from the normal standing state to the reverse state shown in figure, the movable valve 14 which drops toward the opening section 11a is made to collide with a movable valve 13 which has been in contact with the valve seat 10b at the time of the normal standing. By a content reverse flowing operation and the movable valve colliding operation, the movable valve 13 which is being sucked by the valve seat 10b at the initial stage of the change to the reverse state drops downward in figure. Thus, a content flowing-in path (flow passage in D direction) from the inside of the container to an intra-cylinder downstream side space region 21 at the time of the completion of the discharging operation is ensured.