The purpose of the present invention is to provide a multi-chamber vessel configured so as to be capable of: ensuring the opening order of a multi-chamber vessel used for transfusions, etc., said opening order being the initial opening of a weak-seal section between partitioned chambers, followed by the opening of a weak-seal section of a small vessel； and reliably preventing operation error, namely transfusion using only some of the medicine. The multi-chamber vessel comprises an outer bag (10) and an inner bag (32). The outer bag (10) comprises a weak-seal section (28) as a first partition wall and the interior of the outer bag is partitioned by the weak-seal section (28) into partitioned chambers (29, 30) that house each liquid medicine. The inner bag (32) has the outer perimeter thereof sealed by a weak-seal section (38) and houses medicine therein. All or part of the weak-seal section (38) also serves as a second partition wall separating a lower-side partitioned chamber (30) from a discharge control chamber (40). The external pressure that opens the weak-seal section (38) of the inner bag (32) is set greater than the external pressure that opens the weak-seal section (28) that separates the partitioned chambers (29, 30). The weak-seal section (28) is opened, then the seal of the inner bag (32) is opened, as a result of the external pressure on the liquid medicine housed inside the outer bag (10).La présente invention concerne un récipient multi-chambres configuré de manière à être capable de : garantir l'ordre d'ouverture d'un récipient multi-chambre utilisé pour des transfusions, etc., ledit ordre d'ouverture étant l'ouverture initiale d'une section de faible étanchéité entre des chambres séparées, suivie de l'ouverture d'une section de faible étanchéité d'un petit récipient ； et empêcher de façon fiable une erreur d'opération, à savoir une transfusion en utilisant seulement une partie du médicament. Le récipient multi-chambres comprend une poche externe (10)
