Water saving plays an important role in controlling demands for limited water resources in the modern world where water shortage is increasing accompanying water crisis and economic growth. Domestic water consumption in Japan is on the decrease as the use of water - saving fixture has expanded in recent years. Among various plumbing fixtures, some remarkable achievements have been made in the development of water-saving WCs. Saving of water and hot water contributes to saving energy. The importance of hot water saving, in particular, is growing and some faucets with water saving functions have been developed. It is strongly expected that society based on water saving concepts be built by combining water saving technologies and sharing water saving policies of Japan and other countries.%節水は，水ストレスや発展に伴って拡大する水不足を背景に，有限な水資源の需要抑制として必要である。日本の家庭用水使用量は微滅傾向にあり，水使用機器の節水化もー因と考えられる。衛生器具のなかでは便器の節水化が最も著しい。節水·節濕は省CO_2·省エネルギーに寄与し，節湯の重要性が高まり，節湯水栓などが規定されている。日本と諸外国の節水技術·政策を共有して節水型社会を構築することが望まれる。
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