To provide a liquid feed pump, a filter housing, a valve and a spray nozzle and a spray apparatus incorporating these components that can suppress contamination of the liquid being fed. A liquid feed pump 10 includes: a cylinder 12 having a substantially cylindrical shape; and a piston 14 fitted into the cylinder. The liquid feed pressure of the liquid feed pump 10 is equal to or higher than 1 MPa and equal to or lower than 50 MPa, and substantially the whole surface of a liquid contacting part of the liquid feed pump is made of a resin material or a ceramic material.