A fluid pressure cylinder, comprising: a tubular cylinder tube; a piston partitioning the interior of the cylinder tube into a head-side chamber and a bottom-side chamber; and a piston rod coupled to the piston, wherein: the piston rod is solid and internally provided with a head-side passage allowing communication between the head-side chamber and a working fluid pressure source and a bottom-side passage allowing communication between the bottom-side chamber and the working fluid pressure source; wherein the head-side passage is defined by a head-side shaft hole extending in an axial direction of the piston rod, a head-side outer hole connected to the head-side shaft hole and opening on a part of the piston rod projecting from the cylinder tube and a head-side inner hole connected to the head-side shaft hole and opening to the head-side chamber; the head-side shaft hole includes an opening end open on the part of the piston rod projecting from the cylinder tube and a tip formed inside the piston rod; and the opening end of the head-side shaft hole is sealed by a sealing member, and wherein the bottom-side passage is defined by a bottom-side shaft hole extending in the axial direction of the piston rod and a bottom-side outer hole connected to the bottom-side shaft hole and opening on another part of the piston rod projecting from the cylinder tube, and the bottom-side shaft hole includes an opening end open in the bottom-side chamber and a tip formed inside the piston rod, and characterised in that the piston rod includes an annular eye portion on the part projecting from the cylinder tube; an inner plug hole open on an inner peripheral surface of the eye portion is formed at the opening end of the head-side shaft hole; and a plug is embedded as the sealing member into the inner plug hole. a tubular cylinder tube; a piston partitioning the interior of the cylinder tube into a head-side chamber and a bottom-side chamber; and a piston rod coupled to the piston, wherein: the piston rod is solid and internally provided with a head-side passage allowing communication between the head-side chamber and a working fluid pressure source and a bottom-side passage allowing communication between the bottom-side chamber and the working fluid pressure source; wherein the head-side passage is defined by a head-side shaft hole extending in an axial direction of the piston rod, a head-side outer hole connected to the head-side shaft hole and opening on a part of the piston rod projecting from the cylinder tube and a head-side inner hole connected to the head-side shaft hole and opening to the head-side chamber; the piston rod is solid and internally provided with a head-side passage allowing communication between the head-side chamber and a working fluid pressure source and a bottom-side passage allowing communication between the bottom-side chamber and the working fluid pressure source; wherein the head-side passage is defined by a head-side shaft hole extending in an axial direction of the piston rod, a head-side outer hole connected to the head-side shaft hole and opening on a part of the piston rod projecting from the cylinder tube and a head-side inner hole connected to the head-side shaft hole and opening to the head-side chamber; the head-side shaft hole includes an opening end open on the part of the piston rod projecting from the cylinder tube and a tip formed inside the piston rod; and the opening end of the head-side shaft hole is sealed by a sealing member, and wherein the bottom-side passage is defined by a bottom-side shaft hole extending in the axial direction of the piston rod and a bottom-side outer hole connected to the bottom-side shaft hole and opening on another part of the piston rod projecting from the cylinder tube, and the bottom-side shaft hole includes an opening end open in the bottom-side chamber and a tip formed inside the piston rod, and characterised in that the piston rod includes an annular eye portion on the part projecting from the cylinder tube; an inner plug hole open on an inner peripheral surface of the eye portion is formed at the opening end of the head-side shaft hole; and a plug is embedded as the sealing member into the inner plug hole.