The present invention relates to a fluid pressure cylinder, such a fluid pressure cylinder (10), the supply port 26 and the interior of the cylinder tube 12 with the exhaust port 28, a face-to-face and both end faces of the piston 18 the first and the second formed the cylinder chamber (36, 38), the first piston rod 20 connected to one side end face side of the piston 18, the second connected to the other end surface side of the piston 18 to this diameter is formed larger than the piston rod 22. Accordingly, the first pressure-receiving area of ​​the first back pressure receive (18a) formed in the second one side end face of the pressure-receiving area (S2) of the second back pressure receive (18b) formed on the other end face of the piston 18 ( It becomes larger than in S1). Then, the first by supplying the pressure fluid in the cylinder chamber 36 to the second cylinder chamber 38, the first pressure receiving area (S1) and the second piston 18 by the area difference between the second pressure-receiving area of ​​the first It moves toward the first cylinder chamber 36.