Patent ID: 8382071

Claim:
A raw material supply device comprising: a raw material vessel which contains a raw material liquid; an introduction pipe which is connected to said raw material vessel, and introduces a carrier gas into said raw material vessel to bubble the raw material liquid; a transport pipe which is connected to said raw material vessel, and transports a source gas that is produced by bubbling and fed out from said raw material vessel; a pump which is attached to said transport pipe and transports the source gas; a supply pipe which is branched from said transport pipe, connected to a supply target, and supplies the source gas to the supply target; a circulation pipe which is branched from said transport pipe and connected to said introduction pipe; an introduction valve which is arranged on a supply side of the carrier gas from a portion of said introduction pipe to which said circulation pipe is connected; a supply valve which is attached to said supply pipe; a circulation valve which is attached to said circulation pipe; and a controller which is connected to said introduction valve, said supply valve, and said circulation valve, and controls opening/closing of said valves, wherein said controller controls at least said supply valve and said circulation valve to be in opposite open/closed states.