A vehicle radiator core support, includes: a support main body including upper and lower support portions, and paired side support portions connecting right and left ends of the upper and lower support portions; and a center brace connecting intermediate parts of the upper and lower support portions. At least the lower support portion and the center brace are integrally formed. A lower-side connection portion is disposed where the lower support portion connects to the center brace, and a lower-side connection portion cross section has a U-shape opening toward a front or rear of the vehicle. A lower-side adjacent portion is disposed at a part of the lower support portion adjacent to the lower-side connection portion, such that a partition wall is between the lower-side connection and adjacent portions, and a lower-side adjacent portion cross section has a U-shape opening opposite to that of the lower-side connection portion.