An vehicle door latch apparatus includes an engaging mechanism unit and an operating mechanism unit. The operating mechanism unit includes a motor; a worm wheel being rotated by the motor; a sector gear meshing with a pinion provided on one side of the worm wheel and rotating to an unlocking position and a locking position; switch levers connected to the sector gear and shifting to an unlocking position where engagement with a meshing mechanism is releasable and a locking position where the engagement cannot be released; and a key sub-lever pivotally supported on the same pivot on which the sector gear pivots. The key sub-lever is rotatable from a neutral position in an unlocking direction and a locking direction in synchronism with operation of a key cylinder so as to rotate the sector gear to the unlocking position by rotating in the unlocking direction and to rotate the sector gear in the locking direction by rotating in the locking direction. The operating space for operating the key sub-lever can be encapsulated in the operating space for operating the sector gear, thus, it is able to reduce the front projection area and the size of the operating mechanism unit.