Overlapping prefabricated bed joint reinforcement consisting of two parallel longitudinal wires (that are) joined by a central wire. The central wire forms a truss structure and is welded on (in) the same plane along the inner side of the longitudinal wires. It has an innovative design that enables the (performing of the) overlap between reinforcements without the need for any further manipulation, keeping the same nominal width of the reinforcement in the overlap area. The ends of the pieces have a specific geometric plug-shaped configuration which enables the 250mm overlap to be performed without the need to cut the wires. Also, the transverse wire is crushed in said area so that minimum mortar beds can be ensured.