Abstract: A base of a bed having two parallel elastic longitudinal bars arranged at a distance from each other, and several grate-shaped cross slats. The ends of the cross slats are pushed into pockets which are fitted on the longitudinal bars, perpendicularly to the longitudinal direction. Each longitudinal bar has at least one fastening band which is fastened perpendicularly to the longitudinal direction and in the direction of the other longitudinal bar. The neighboring cross slat has a button for attaching the fastening band to the cross slat. This structure guarantees stable and non-aging fastening of the cross slats to the longitudinal bars with minimal means and the structure is also easy to assemble.