6 are attached by inserting large diameter parts of insert shaft parts 8 formed corresponding to the cylinder hole 3 into the cylinder hole 3 and in that state screwing in tapping screws 9 into the mounting holes 5 for end member mounting use of the cylinder tube 2 the insert shaft parts 8 have piston dampers 10 integrally attached to them the piston dampers 10 and the insert shaft parts 8 form gasket grooves 11 into which cylinder gaskets 12 are fit at the cylinder hole 3 of the cylinder tube 2 a piston 13 comprised of a piston body 13 a at the two ends of which piston ends 13 b are provided is fit due to the piston 13 the cylinder chamber 7 is divided into front and rear cylinder chambers 7 a 7 b inside the front and rear cylinder chambers 7 a 7 b pressurized fluid supplied from the supply discharge holes 14 of the end caps 6 causes the piston 13 to move back and forth at the piston body 13 a a piston yoke 15 passing through the slit 4 is integrally formed part of the piston yoke 15 spreads to the left and right at the outside of the cylinder tube 2 to form a piston mount 16 the piston 13 piston yoke 15 and piston mount 16 form a moving member 17 at the outer circumference of the bottom end of the piston mount 16 a scraper 18 is attached over the entire circumference this prevents entry of dust from the clearance between the top surface of the cylinder tube 2 and the bottom surface of the piston mount 16 the inside and outside of the slit 4 are closed by the inside and.