Fluid leakage detection device and reciprocating fluid pressure device

A fluid leakage detection device for detecting a leakage of working fluid from a gap between a piston rod and a cylinder head, the piston rod being projected out from a cylinder tube, the cylinder head being provided on the cylinder tube, and the cylinder head being configured such that the piston rod is inserted through the cylinder head, the fluid leakage detection device comprising:

• an annular member attached to the cylinder head, the annular member being configured such that the piston rod is inserted through the annular member;
• a passage formed in the annular member, the passage being configured such that the working fluid is guided to the passage from a gap between an outer circumference of the piston rod and an inner circumference of the cylinder head;
• and
• a detector configured to detect the working fluid guided through the passage, wherein
• the annular member includes a press-fitted portion, the press-fitted portion being configured to be press-fitted to an annular groove formed in the cylinder head.