The invention concerns a strut bearing unit (10), comprising a bearing (20), a lower cup (30) and an upper cup (40), the lower cup (30) comprising a tubular axial portion (31) and an annular outward radial portion (32), characterized in that the lower cup (30) includes two stiffening inserts (70, 80) which are distinct from each other, with a first insert (70) comprising at least an axial portion (71) located within the axial portion (31) of the lower cup (30), and a second insert (80) comprising at least a radial portion (82) located within the outward radial portion (32) of the lower cup (30). The invention also concerns a motor vehicle equipped with such a strut bearing unit (10) and a method for manufacturing such a strut bearing unit (10).
