To provide a liquid vessel for medical care treatment allowing easy visual confirmation of an amount of a stored fluid or liquid medicine and capable of eliminating a possibility of its breakage due to contact and shock.

This liquid vessel 11 for medical care treatment is formed by a vessel body 12 which has rigidity, is made of a synthetic resin material, and forms a square box shape. A storage part S1 and a small storage part S2 capable of storing a smaller amount of urine than the storage part S1 are formed in the vessel body 12. A visual confirmation window 29 is integrally formed on a side face of the vessel body 12, and an amount of urine in the storage part S1 and the small storage part S2 can be visually confirmed through the visual confirmation window 29.