WATER STORAGE TANK AND HOUSE

To provide a water storage tank that can be easily manufactured, and can reliably prevent water and air from stagnating inside.SOLUTION: A water storage tank 2 includes a polyethylene or polypropylene tube body 6 formed in a cylindrical shape, and two lids 7 and 8 made of polyethylene or polypropylene formed to seal an opening provided at both ends in an axial direction of the tube body 6. Each of the lids 7 and 8 is joined to the end of the tube body 6 by fusion welding. With the water storage tank 2 installed in a predetermined installation posture, a first outflow port 22 is provided at the lower end of the inner periphery of the lid 8, and a second outflow port 23 is provided at the upper end of the inner periphery of the lid 8, so that water inside the tube body 6 can flow out of the first outflow port 22 and air can flow into the interior of the tube body 6 from the second outflow port 23.SELECTED DRAWING: Figure 7 【課題】容易に製造可能であり、且つ内部での水や空気の滞留を確実に防止することができる貯水槽を提供する。【解決手段】貯水槽２は、円筒状に形成された、ポリエチレン製又はポリプロピレン製の管体６と、管体６の軸線方向の両端部の開口部を塞ぐように形成された、ポリエチレン製又はポリプロピレン製の２つの蓋部７，８と、を備える。蓋部７，８の各々と管体６の端部とは融着により接合されている。貯水槽２が所定の設置姿勢で設置された状態において、蓋部８の内周面の下端に第１流出口２２が設けられ、蓋部８の内周面の上端に第２流出口２３が設けられ、管体６の内部の水が第１流出口２２から流出可能であり、第２流出口２３から管体６の内部に空気が流入可能である。【選択図】図７