To certainly improve the durability and reliability of an accumulator device by preventing pressure oil in a hydraulic pipe line from flowing into a closed container in a turbulent flow state.

An accumulator device is provided with a bellows 6 where a basic end side is fixed to the fixing part 3E in a closed container 3, and a tip end side extends telescopically toward a bottom part 3B, and the tip side of the bellows 6 is provided with a sealed body 9. The inside of the closed container 3 is partitioned into a gas chamber A and an oil chamber B by the bellows 6, and the thread part 3C of the closed container 3 is provided with a large diametral oil passing port 4 opened toward an oil pressure pipe line 1 and each small diametral branched path 5 which communicates with an oil passing port 4 on one end side and opens inside the closed container 3 on another end side, and each branched path is opened and closed by the sealing body 9.