The invention relates to a vehicle suspension arm supporting structure. A receiving portion 9 is formed integrally on a subframe 5 which is formed of a light metal in such a manner as to extend transversely outwards, and a sheet steel member 15 is connected to the subframe 5 by a bolt or a nut in such a manner as to be situated below the receiving portion 9 of the subframe 5 at a predetermined interval. A base portion 13b of a suspension arm 13 is disposed between the receiving portion 9 of the subframe 5 and the sheet steel member 15, the base portion 13b of the suspension arm 13 is supported on the subframe 5 via a rubber bushing joint 14 by a connecting bolt 16 which vertically passes through the receiving portion 9 of the subframe 5 and the sheet steel member 15, and the receiving portion 9 of the subframe 5 is connected to a side member 4 by the connecting bolt 16.