Shelf system for placing a shelf divider transversely of a longitudinal direction of a shelf, comprising: a first elongate coupling element, which first coupling element can be mounted on a front side of the shelf substantially parallel to a longitudinal direction of the shelf, a second elongate coupling element, which second coupling element can be mounted on a rear side of the shelf substantially parallel to the longitudinal direction of the shelf, a shelf divider comprising a first coupling part and a second coupling part, wherein the first and second coupling part are configured to be coupled to respectively the first and second coupling element when the shelf divider is placed; characterized in that the second coupling element comprises: a base plate for placing on a surface of the shelf; a positioner extending from the base plate; a clamping wall extending obliquely from the base plate and is configured to be directed toward the front side of the shelf after placing of the shelf divider; a recessed portion formed in the base plate and placed between the positioner and the clamping wall; and that the second coupling part comprises a downward sloping end and a downward directed protrusion, wherein the protrusion engages in the recessed portion after placing of the shelf divider for the purpose of fixing the shelf divider in the transverse direction of the shelf and wherein the downward sloping end is clamped between the clamping wall and the base plate for the purpose of fixing the shelf divider in the longitudinal direction of the shelf. a first elongate coupling element, which first coupling element can be mounted on a front side of the shelf substantially parallel to a longitudinal direction of the shelf, a second elongate coupling element, which second coupling element can be mounted on a rear side of the shelf substantially parallel to the longitudinal direction of the shelf, a shelf divider comprising a first coupling part and a second coupling part, wherein the first and second coupling part are configured to be coupled to respectively the first and second coupling element when the shelf divider is placed; characterized in that the second coupling element comprises: a base plate for placing on a surface of the shelf; a positioner extending from the base plate; a clamping wall extending obliquely from the base plate and is configured to be directed toward the front side of the shelf after placing of the shelf divider; a recessed portion formed in the base plate and placed between the positioner and the clamping wall; and that the second coupling part comprises a downward sloping end and a downward directed protrusion, wherein the protrusion engages in the recessed portion after placing of the shelf divider for the purpose of fixing the shelf divider in the transverse direction of the shelf and wherein the downward sloping end is clamped between the clamping wall and the base plate for the purpose of fixing the shelf divider in the longitudinal direction of the shelf. a base plate for placing on a surface of the shelf; a positioner extending from the base plate; a clamping wall extending obliquely from the base plate and is configured to be directed toward the front side of the shelf after placing of the shelf divider; a recessed portion formed in the base plate and placed between the positioner and the clamping wall; and that the second coupling part comprises a downward sloping end and a downward directed protrusion, wherein the protrusion engages in the recessed portion after placing of the shelf divider for the purpose of fixing the shelf divider in the transverse direction of the shelf and wherein the downward sloping end is clamped between the clamping wall and the base plate for the purpose of fixing the shelf divider in the longitudinal direction of the shelf.