The invention provides a fender liner structure that prevents mud etc. thrown forward off a front wheel from entering into a fender from water drain holes in a fender liner and that prevents muddy water splashing upward from passing through the water drain holes to reach an air intake opening located above the drain holes. The fender liner structure is adapted for a vehicle that has an air intake opening (9) in the upper part in a space surrounded by a fender, a fender apron, and a fender liner (10) and is constructed to lead air in the space (9) to an engine. A fender liner body (12) is placed surrounding a tread section (Tr) of a front wheel (T), and water drain holes (20) are formed in the fender liner body (12) so as to be circumferentially arranged at positions forward from the center of the front wheel (T). Each drain hole (20) has an opening (21) directed upward and having a large opening area in the top-bottom direction and a small opening area in the front-rear direction, and the drain hole (20) also has eaves (22) with which muddy water splashing upward and attempting to pass through the opening (21) collides.