Abstract: A spring deck for upholstered seating consisting of a thin deck sheet, flexible transversely of its plane but inelastic in its plane, arranged generally horizontally over an open seat frame, and being connected at its front and rear edges to the frame, the connection at its rearward edge being by edge springs resiliently yieldable toward its forward edge so that it may yield downwardly responsively to top loading, and vertically yieldable sub-springs disposed beneath the central portion of the deck sheet and biased to offset that portion of the deck sheet upwardly above a plane determined by its front and rear edge connections, so that a load imposed on the deck is supported first by the sub-springs and later by both the sub-springs and the edge springs. The forward edge of the deck sheet may be supported by springs which are vertically yieldable, but not yieldable toward the rear deck sheet edge, in order that the deck sheet provides a soft-edge yieldability at its forward edge.