| 摘要 |
PROBLEM TO BE SOLVED: To provide a rainwater utilization system in which rainwater can be utilized, considering the sanitary side. SOLUTION: A rainwater storage tank 5 for previously storing rainwater received by a gutter or the like and flowed and guided is installed to a wall surface, an underground section or the like. A supply means 7 supplying a toilet flush-water tank with stored water in the rainwater storage tank 5 is mounted, and a branching supply means for branching a part of flowed and guided rainwater and supplying the rainwater storage tank 5 with rainwater is set up.
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