A liquid vaporizer includes a first housing having a liquid-supplied surface to which a chemical solution is supplied, a heater, a mesh, a first holder and a second holder attached to the outer edge portions of the mesh, the outer edge portions opposing each other in a direction of spreading of the mesh, first cover bolts, stems supported by the first housing so as to be movable along a specific direction inclined with respect to the liquid-supplied surface, second cover bolts, coil springs biasing the stems along the specific direction and bring the mesh into intimate contact with the liquid-supplied surface, and a lid member covering the mesh from a side of the liquid-supplied surface to seal a space around the liquid-supplied surface with the first housing.