To provide a warm water-water mixing device by which a spouting head can be drawn to use and mounting holes for a counter are not required to open again when exchanging a faucet.

A body having a spout pipe, a water supply passage and a hot water supply passage in the body, a hot water-water mixing valve mixing hot water with water supplied from the hot water supply passage and the water supply passage, a spouting head spouting the mixed water from the valve, a water supply pipe connecting the hot water-water mixing valve to the spouting head through the spout pipe, and a water purifier arranged in the outside of the body and an opening/closing valve arranged in the inside of the body are installed in the middle way. In the warm water-water mixing device constituted of a purified water passage branched from the water supply passage and converges on the water supply passage and a part of the water spouting passage, in at least one of the water supply passage, the hot water supply passage, the water spouting passage, and the purified water passage, a tubular material is used for a part or the whole of a part positioning in the outside of the body and a shape other than a cylindrical shape is used for a part or the whole of a part constituted of the tubular material.