The present invention provides a rear fender support structure for a saddled vehicle with a compact stay. The rear fender support structure is used with a saddled vehicle equipped with: a rear fender(47); and a stay (54) which has a joined structure of left and right sections, forms a space (70) therebetween, supports a license plate (77) and the rear fender (47) in the tip section, and allows electric components (75, 76) to be installed thereon. The support structure is provided with an arm section (56) extending from a base section (55) of the stay (54) toward the front of the vehicle body,a cargo hook engagement part (84) is formed on the arm section (56), and fastening parts (55a, 56a) are provided on end parts of the base section (55) and the arm section (56).