To prevent beauty from being lost by attaching a branched cut-off faucet taken out by branching original water from a composite faucet to a switching device for switching the discharge water of cleaned water and sealing water, and detachably mounting the switching device on the faucet body.

A single lever 7 disposed on the upper end of the faucet body 3 of a mixing faucet 2 is operated to switch the discharge water of original water from the discharge opening 4a of a spout 4 and sealing water so as to perform temperature regulation of the discharge water. The switching lever 5a of a switching device 5 disposed on the lower part of the faucet body 3 is rotated and operated to open and close a switching valve 5b, and the discharge water of cleaned water from the cleaned water discharge opening 4b of the spout 4 and sealing water are switched. In addition, the cut-off lever of a branched cut-off faucet 6 is operated to switch feed water for a tableware washing machine 8 through a feed water hose 9 from the branched cut-off faucet 6 and sealing water. Thereby only a part attaching the branched cut-off faucet 6 is large, surface processing conditions of the part attaching the branched cut-off faucet 6 and the other part are different from each other, and beauty can be prevented from being lost.