PURPOSE: To provide an image-receiving sheet for thermal transfer ink generat ing no fading even in the case of the long-term irradiation with ultraviolet rays, and a label-printing cassette using the same.

CONSTITUTION: An image-receiving sheet for thermal transfer ink is constituted of the color layer 2 formed on the single surface of a base material sheet 3, the image receiving layer 1 formed on the surface on the side opposite to the base material sheet 3 of the color layer 2, the self-adhesive layer 4 formed on the other surface of the base material sheet 3 and the separator 5 covering the self-adhesive layer 4. Ultrafine particles with a particle size of 100nm or less and an ultraviolet absorber are added to the image receiving layer 1.