A fluid pressure cylinder comprising: a first cylinder portion partitioned by a first piston into a first accumulation chamber disposed on a head side and a second accumulation chamber disposed on a rod side; a second cylinder portion partitioned by a second piston into a release chamber disposed on the head side and a drive chamber disposed on the rod side; and a supply-and-discharge port through which pressurized fluid is supplied to and discharged from the second accumulation chamber and the drive chamber, wherein: the first cylinder portion and the second cylinder portion are disposed in parallel; an end of a first piston rod connected to the first piston and an end of a second piston rod connected to the second piston are connected to each other; the first piston is provided with a communication switching valve configured to switch communication between the first accumulation chamber and the second accumulation chamber, between enabled and disabled; characterized in that the second accumulation chamber is connected to the supply-and-discharge port via a flow path provided with a check valve, the check valve allowing fluid to flow from the supply-and-discharge port toward the second accumulation chamber and blocking flow of fluid from the second accumulation chamber toward the supply-and-discharge port. a first cylinder portion partitioned by a first piston into a first accumulation chamber disposed on a head side and a second accumulation chamber disposed on a rod side; a second cylinder portion partitioned by a second piston into a release chamber disposed on the head side and a drive chamber disposed on the rod side; and a supply-and-discharge port through which pressurized fluid is supplied to and discharged from the second accumulation chamber and the drive chamber, wherein: the first cylinder portion and the second cylinder portion are disposed in parallel; an end of a first piston rod connected to the first piston and an end of a second piston rod connected to the second piston are connected to each other; the first piston is provided with a communication switching valve configured to switch communication between the first accumulation chamber and the second accumulation chamber, between enabled and disabled; characterized in that the second accumulation chamber is connected to the supply-and-discharge port via a flow path provided with a check valve, the check valve allowing fluid to flow from the supply-and-discharge port toward the second accumulation chamber and blocking flow of fluid from the second accumulation chamber toward the supply-and-discharge port. the first cylinder portion and the second cylinder portion are disposed in parallel; an end of a first piston rod connected to the first piston and an end of a second piston rod connected to the second piston are connected to each other; the first piston is provided with a communication switching valve configured to switch communication between the first accumulation chamber and the second accumulation chamber, between enabled and disabled; characterized in that the second accumulation chamber is connected to the supply-and-discharge port via a flow path provided with a check valve, the check valve allowing fluid to flow from the supply-and-discharge port toward the second accumulation chamber and blocking flow of fluid from the second accumulation chamber toward the supply-and-discharge port.