[Problem] To prevent urine accumulated in a bag main body from being visually recognized by others, to open a scale part when necessary to check the state of accumulation of urine, and to allow urine accumulated in the center of the bag main body when collecting urine. To provide a urine storage bag that can be easily fixed even if a part swells and can improve workability in manufacturing the urine storage bag. A bag main body (11) is provided, and the surface of the bag main body (11) is provided with a covering (20) for covering urine in the bag main body in a state in which it cannot be visually recognized; It has a graduated portion 21 for visually measuring accumulated urine and a flap portion 22 for covering the graduated portion on the surface side of the bag main body so as to be opened and closed, and the flap portion extends in the width direction of the bag main body. It is fixed to the bag main body at its end and configured to open and close the inner side of the bag main body. [Selection drawing] Fig. 5【課題】他人により袋本体部内に蓄積された尿を外部から視認されることを防止しつつ、必要時には目盛り部を開放して尿の蓄積状態を確認でき、かつ、蓄尿時に袋本体部の中央部が膨らんでも固定時に固定し易くなると共に、蓄尿袋の製造に係る作業性を向上することができる蓄尿袋を提供する。【解決手段】袋本体部11を有し、袋本体部の表面部には、袋本体部内の尿を視認不可能な状態で被覆する被覆部20と、被覆部に隣接して袋本体部内に蓄積された尿を視認して計量できる目盛り部21と、目盛り部を袋本体部表面側において開閉可能に被覆することができるフラップ部22とを有し、フラップ部は、袋本体部の幅方向端部において袋本体部に固定され、袋本体部内方側を開閉するように構成されている。【選択図】図5