SURFACE SUBSTRATE FOR HEAT TRANSFER IMAGE RECEPTION SHEET, AND HEAT TRANSFER IMAGE RECEPTION SHEET

To provide a front face side substrate for a heat transfer image-receiving sheet, which is possible to perform high-quality image formation on a receiving layer even when the substrate is made thinner in order to suppress the occurrence of curling, and to provide a thermal transfer image-receiving sheet having the front face side substrate for thermal transfer image-receiving sheet. The above problem is solved by a front face side substrate (10) for a thermal transfer image-receiving sheet, the front face side substrate for the thermal transfer image-receiving sheet being provided between a supporting member and a receiving layer of the thermal transfer image-receiving sheet; the front face side substrate for the thermal transfer image-receiving sheet comprising a layered structure in which a front face side layer (3) is provided on one surface of a substrate layer (2) and a rear face side layer (1) is provided on another surface of the substrate layer (2); wherein the substrate layer comprises (A) a propylene-based polymer, (B) calcium carbonate, and (C) titanium oxide, and the weight of (A) being in the range of from not less than 70 % by weight to not more than 94.5 % by weight, the weight of (B) being in the range of from not less than 5 % by weight to not more than 28 % by weight, and the weight of (C) being in the range of from not less than 0.5 % by weight to not more than 3 % by weight, based on the assumption that the total weight of (A), (B) and (C) is 100 % by weight; the front face side layer (3) comprises a modified propylene-based polymer; and the rear face side layer (1) comprises a propylene-based polymer.