PARTITION MEMBER

The present disclosure provides a partition member that can suppress a reduction in heat-insulating properties. A partition member () is interposed between any pair of cells () adjacent to each other in a stacking direction in a stack () of multiple cells (). The partition member () includes: a heat-insulating layer (); a spacer layer () interposed between the heat-insulating layer () and the cell () and made of a material different from that of the heat-insulating layer (); and a permeation-suppressing layer () interposed between the heat-insulating layer () and the spacer layer () and configured to suppress permeation of the material of the spacer layer () into the heat-insulating layer ().