Abstract: The heat sink, particularly for a thermoelectric module, is of the kind formed of a plurality of first fin plates and second spacer plates, alternately disposed side by side and in contact with one another, and comprises fastening members which extend through the first and second plates for fastening one to the other. Each of said first and second plates has on one side at least a protrusion and on the opposite side at least a recess. The protrusion on one side of said first and second plates engages into the recess on a facing side of said second and first plates, respectively, with a positive fit. The protrusion on one side and the recess on the opposite side of said first and second plates are disposed out of alignment relative to a straight line on the plane of the plates intersecting the axis of the fastening members.