Fluid pump

A fluid pump comprising:

• a cylinder;
• a piston mounted inside the cylinder to be moved back and forth, the piston partitioning the inside of the cylinder between a pressure increasing/decreasing chamber on the side of the cylinder head and a drive chamber opposite the pressure increasing/decreasing chamber;
• a valve unit having a control space for causing fluid of the pressure increasing/decreasing chamber to act on a pressurizing/depressurizing object and a feeding/discharging space for feeding/discharging fluid between the pressure increasing/decreasing chamber and the outside space, the valve unit being provided in the cylinder head so as to control flow of the fluid to the pressure increasing/decreasing chamber at the time of a reciprocal movement of the piston:
• a path block mounted to the cylinder;
• a ventilation path communicating the drive chamber and the outside space with each other via the path block;
• a fluid path connected to the feeding/discharging space and the path block so as to be merged with the ventilation path in a merging space inside the path block;
• a fluid filter mounted in the merging space;
• and
• an opening defined in a bottom wall of the path block for establishing communication between the interior space of the path block and the outside space;
• and
• wherein an upper face of the bottom wall is formed with an inclined posture such that the upper face is positioned lower as it extends toward a position closer to the opening.