To provide a sealing band holder having a highly reliable function capable of being embodied at a low cost and offer a new pressure fluid cylinder incorporating such a sealing band holder.

A pressure fluid cylinder 1 includes a cylinder tube equipped with a means to transmit a displacement of a movable piston 11 inside the cylinder through a longitudinally stretching slot sealed by an internal sealing band 4, and a holder for this sealing band 4 to hold its end part upon being incorporated in the end wall 3 is furnished with a recess 5 comprising a first portion extending in the end wall 3 in the axial direction for accommodating the internal sealing band along the axis and a second portion 10 to rotatably receive a screw component 6 to be engaged with the sealing band 4 fitted in the recess 5. A pressure fluid cylinder is configured using this holder at the end.