The purpose of the present invention is to provide a multi-chamber vessel for use in transfusions, etc., configured so as to be capable of: ensuring the opening order of the multi-chamber vessel, 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 as a weak-seal section (28) as a first partition wall. 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-sealed 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 first, 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 contenant multi-compartiment destiné à des transfusions et autres et conçu pour pouvoir : garantir l'ordre d'ouverture du contenant multi-compartiment, cet ordre d'ouverture étant l'ouverture initiale d'une section à joint faible entre les compartiments divisés, suivie par l'ouverture d'une section à joint faible d'un petit contenant ； et éviter de façon fiable une erreur d'opération, à savoir une transfusion en n'utilisant que certains des médicaments. Le contenant multi-compartiment comprend une poche extérieure (10) et
