A mattress including: substrates configured to support a human body； and a plurality of cells arranged on an upper face of each substrate, the cells including respective fluid chambers. The substrates are divided from each other at a location corresponding to a folding part provided to a portion of a bed in a length direction thereof such that cell units are constituted by the respective substrates and the cells arranged thereon. The cell units are disposed such that the cell units are adjacent to each other with the folding part interposed therebetween. A connecting body is disposed between the cell units such that the connecting body straddles the cell units and is supported by the cells of the cell units.
