Abstract: The present invention provides a supporting system for furniture, comprising; a rail (100), adapted to be mounted on a substantially vertical plane; and a projecting male member (200), connected to the rail (100), said male member projecting distally of said rail (100). The male member (200) provides a mounting plane transversal to the longitudinal direction of said rail, such that said male member (200) is configured to be enclosed by a mating female member (400). The female member (400) being located at a side piece of a furniture; said male member (200) and female member (400), in use, having two vertical support surfaces and at least one horizontal support surface each, arranged such that relative longitudinal displacement of male member (200) and female member (400) is hindered, and the horizontal support surface of the male member (200) supports the horizontal support surface of the female member (400), such that they allow horizontal mounting of the side piece on the rail (100).