A fluid pressure cylinder with a piston rod fastened to a piston reciprocating in a cylinder tube, comprising: a closing member adapted to close an end opening portion of the cylinder tube; a working chamber defined between the closing member and the piston; a supply/discharge port formed in the closing member and communicating with the working chamber; and a cushion mechanism adapted to decelerate the piston rod in the vicinity of a stroke end when a working fluid of the working chamber is discharged through the supply/discharge port and the piston rod makes a stroke, wherein the cushion mechanism includes: a cylinder portion fitted with an inner peripheral surface of the cylinder tube; an annular holder fastened to an end surface of the cylinder portion; an annular entry portion provided annularly on the piston rod and advancing into the holder and the cylinder portion in the vicinity of the stroke end; a cushion passage formed on the holder and leading the working fluid of the working chamber to the supply/discharge port when the annular entry portion enters into the holder and the cylinder portion; characterised by an orifice plug fastened to the cushion passage and applying resistance to a flow of the working fluid; and the cushion passage includes: an inlet passage formed between an inner peripheral surface of the cylinder tube and an outer peripheral surface of the holder; and an internal passage opened to the outer peripheral surface of the holder, extending in a radial direction of the holder, and to which the orifice plug is fastened; and the orifice plug is replaceable through a replacement port formed by penetrating the cylinder tube and communicating with the internal passage. a closing member adapted to close an end opening portion of the cylinder tube; a working chamber defined between the closing member and the piston; a supply/discharge port formed in the closing member and communicating with the working chamber; and a cushion mechanism adapted to decelerate the piston rod in the vicinity of a stroke end when a working fluid of the working chamber is discharged through the supply/discharge port and the piston rod makes a stroke, wherein the cushion mechanism includes: a cylinder portion fitted with an inner peripheral surface of the cylinder tube; an annular holder fastened to an end surface of the cylinder portion; an annular entry portion provided annularly on the piston rod and advancing into the holder and the cylinder portion in the vicinity of the stroke end; a cushion passage formed on the holder and leading the working fluid of the working chamber to the supply/discharge port when the annular entry portion enters into the holder and the cylinder portion; characterised by an orifice plug fastened to the cushion passage and applying resistance to a flow of the working fluid; and the cushion passage includes: a cylinder portion fitted with an inner peripheral surface of the cylinder tube; an annular holder fastened to an end surface of the cylinder portion; an annular entry portion provided annularly on the piston rod and advancing into the holder and the cylinder portion in the vicinity of the stroke end; a cushion passage formed on the holder and leading the working fluid of the working chamber to the supply/discharge port when the annular entry portion enters into the holder and the cylinder portion; characterised by an orifice plug fastened to the cushion passage and applying resistance to a flow of the working fluid; and the cushion passage includes: an inlet passage formed between an inner peripheral surface of the cylinder tube and an outer peripheral surface of the holder; and an internal passage opened to the outer peripheral surface of the holder, extending in a radial direction of the holder, and to which the orifice plug is fastened; and the orifice plug is replaceable through a replacement port formed by penetrating the cylinder tube and communicating with the internal passage.