To provide a heat-treated multi-chamber container in which suitable heat treatment can be simultaneously applied to stored objects in respective chambers in the state of storing the storage objects of respective different quantities in storage chambers and a partitioned chamber smaller than the storage chambers.
In this flexible multi-chamber container having a plurality of storage chambers 4 and 8, the container has a container body 5 equipped with a storage space 17 storing a storage liquid and a storage container 10 equipped with a partitioned chamber 8 liquid-tightly partitioned with the storage space 17 and storing an easily thermally degenerative component and a separated portion 23 operable for opening via a container wall 11 in the container body 5 and stored in the storage space 17, and is heat-treated in the state of respectively storing the storage liquid and the easily thermally degenerative component at least in the storage space 17 storing the storage container 10 and the partitioned chamber 8, and the easily thermally degenerative component in the partitioned chamber 8 of the storage container 10 is heated correspondingly to the temperature change of the stored liquid in the container body 5 such that excessive heat treatment from the stored liquid is not applied.
