A vehicle door latch device includes: a seal sticking portion at which an upper seal portion of a waterproof seal is stuck, and which is provided upward in a protruding manner at an upper portion of a body accommodating portion; an upper positioning unit which is provided at a lower edge and a side edge on an extra-vehicle side of the seal sticking portion, the upper positioning unit being configured to receive and position a lower surface and an end face on the extra-vehicle side of the upper seal; and a side positioning unit which is configured to position a side seal portion of the waterproof seal to be directed diagonally downward, and which is provided on a surface on an intra-vehicle side of the cover where the side seal portion is stuck.