To provide a bulk feeder which is easy to install and exchange a gas feeding system for a bulk reservoir, and compact as a whole.

One end of a first support fitting and gas piping of the gas feeding system are fastened together by a U bolt for a pipe support fitting welded to the bulk reservoir. Outlet piping of a leakage detector is fastened for the other end of the first support fitting by the U bolt. One end of a second support fitting is fastened for the outlet piping of the leakage detector by the U bolt. Inlet piping of the leakage detector is fastened for the other end of the second support fitting by the U bolt. A flexible copper pipe fitting is installed in the inlet of the gas feeding system connected to a gas withdraw valve of the bulk reservoir.