To provide a raw water reformer capable of utilizing the space near the bathroom wall.SOLUTION: The raw water reformer includes a device body 52 fixed to the bathroom wall. The device body 52 is provided with an internal water passage 24 that guides raw water sent from a primary pipe to a secondary pipe via either the raw water supply path or the reformed water supply path. The internal water passage 24 is provided with a downstream water channel that guides water sent from the raw water supply channel and the reformed water supply channel to the secondary pipe. The downstream water channel includes a first downstream waterway 36a that extends toward the bathroom wall as it goes downstream of the downstream waterway.SELECTED DRAWING: Figure 8
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