To provide a diaphragm valve capable of further suppressing an electrostatic breakdown of a diaphragm 21.

An electric conductor film 25 such as carbon is formed, for example, in a spiral shape having no adverse influence on the movement of the diaphragm 21, on a surface on the side of not contacting with liquid of the diaphragm 21. The outer end of the electric conductor film 25 is connected to a leader electric conductor film 23 formed on an upper surface of a diaphragm holding member 22, and a grounding electric conductor film 24 is connected to this leader electric conductor film 23, and the grounding electric conductor film 24 is extended up to a bottom surface along a side surface of a body 10.