A liquid vaporizer is configured to vaporize a liquid reagent and mix the vaporized liquid reagent with a gaseous medium. The liquid vaporizer is equipped with a main vaporizer body having a mixed gas generating space, and a vaporizing unit disposed inside the mixed gas generating space. The vaporizing unit has a vaporizing unit main body having a vaporization surface and a net-shaped body formed in a planar shape by knitting wires regularly in a net-like shape. The net-shaped body forms a plurality of mesh spaces surrounded by the wires and arranged regularly in the in-plane direction. The vaporizing unit forms a plurality of liquid reagent supply spaces surrounded by the wires and the vaporization surface as a result of the net-shaped body and the vaporization surface being abutted against each other. The liquid reagent supply spaces are arranged regularly in the in-plane direction of the net-shaped body.