Vehicle door rear doorsill

The utility model relates to a car door rear doorsill, and relates to the technical field of car spare parts, the car door rear doorsill comprises a rear doorsill body and a supporting plate, the rear doorsill body is clamped on the supporting plate, one side, close to the supporting plate, of the rear doorsill body is fixedly connected with a plurality of first reinforcing ribs, and when the rear doorsill body is clamped on the supporting plate, the first reinforcing ribs are fixedly connected with the supporting plate. The side, away from the rear doorsill body, of the first reinforcing rib abuts against the supporting plate. The rear doorsill has the advantages that the situation that the rear doorsill serving as a bearing area collapses and deforms after being used for a long time, and consequently a joint is formed in the connecting position of the rear doorsill body and the C column is reduced, and therefore the effect that the safety and the attractiveness are affected is reduced. 本申请涉及一种车门后门槛，涉及汽车零配件技