Object of the present invention is to provide a pulley of the pulley belt system for a continuously variable transmission and the arrangement of the piston and cylinder forming a pressure chamber briefly to simplify the processing and assembly.; The pulley, the fixed sheave 1 and the moving sheave 3 and the moving sheave oil pressure chamber 5 so that the oil pressure (3) for changing the diameter of the belt pulley system for a continuously variable transmission according to the present invention in order to realize this, includes a piston (7) and the cylinder (9) forming, in particular, the piston 7 is fixed to one side of the fixed sheave (1), a cylinder (9) is sealed to the other one side of the piston 7 ( 19) it is mounted to maintain the confidentiality of the hydraulic chamber and the fitting bottom surface and inhibiting movement of the sheave 3 in contact with the opposite side of the moving sheave (3) via a.
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