An accumulator of the type that an interior of a vessel main body provided with a feed/discharge port or ports is partitioned into a gas chamber and a liquid chamber by means of a bladder, an inner tube having communication holes is disposed between the feed/discharge port or ports and the bladder, and valve bodies for opening and closing the communication holes are provided on the inside of the inner tube; the communication holes are inclined with respect to the axis of the vessel main body so that liquid passing through the communication holes may collide obliquely against the valve bodies.