Patent ID: 8370979

Claim:
A mattress comprising: a plurality of spring units respectively constituted by holding a plurality of vertically stretchable coil springs integrally; a housing holding member in which a unit-housing recess capable of housing and holding the plurality of spring units is formed; and an enclosure covering the outer periphery of the housing holding member; wherein the mattress is configured so that the housing holding member is provided with a dividing member to divide the unit-housing recess into a plurality of divided housing recesses; and the plurality of spring units is formed in such a shape that each of the spring units is housed in the divided housing recesses, and is housed and held in the respective recesses of the plurality of divided housing recesses, wherein the dividing member is formed using an elastically deformable plate-shaped member and is housed in the unit-housing recess, and the dividing member, when housed in the unit-housing recess, has irregularities in the vertical direction formed on at least one of the end faces in the vertical direction.