A power transmitting device for a vehicle for transmitting a driving force from a driving source to right and left axles. The power transmitting device includes a housing, a planetary gear type speed reducing mechanism connected to the driving source, a differential gear unit arranged in coaxial relationship with the planetary gear type speed reducing mechanism and connected to the right and left axles, and an oil reservoir provided in a lower region of the housing. The differential gear unit has a differential case formed integrally with a planetary carrier of the speed reducing mechanism. The planetary carrier includes first and second annular members axially spaced apart from each other and a plurality of connecting portions for connecting the first and second annular members, each of the connecting portions having a substantially V-shaped configuration opening outward in the radial direction of the first and second annular members.