A modular bed includes a base frame unit and a plurality of support frame units. Each of the support frame units includes a leading bar, a trailing bar, four mounting frames, four biasing members, a left linkage, and a right linkage. In response to loading or unloading of a retaining member of each of the left and right linkages, a respective one of the biasing members abuts against a top abutment wall or a bottom abutment wall of a respective one of the mounting frames so as to generate a counteracting force to counteract the loading or unloading movement of the retaining member, thereby providing a cushioning effect for the retaining member.
