The objective of the utility model is to provide a vehicle door locking device, so cost can be reduced and waterproofness can be ensured. According to the utility model, a band-shaped sealing part covers and extends along the whole upper edge part of a first outer side face and the whole upper edge part of a second outer side face, is wound around for more than half of a cycle of a connector, and shields the whole upper part of a lock catch accepting groove, the whole upper part which is exposed out of the second outer side face and connected with a first power input part connected with a handle linkage part, and the whole upper part and the whole of one side of the connector. Therefore, just by arranging the band-shaped sealing part, the connector and an end part, connected with first power input part, in the handle linkage part can be protected from being wetted by water; and water is prevented from entering the lock catch accepting groove, so cost is reduced and waterproofness is ensured.