Connecting element for detachably connecting a child seat support to a vehicle seat

A connecting element for detachably connecting a seat support to a vehicle seat which comprises a seat portion, a backrest and connecting brackets disposed between said backrest and said seat portion. The connecting element comprises a frame which can be detachably connected to the seat support, and at least two hook-shaped elements, which can be adjusted in at least three positions with respect to the frame and which can be detachably connected to the connecting brackets.