In a fender panel fixing structure of a passenger vehicle according to the present invention, a notch portion of a fender panel is provided with a first flat plate-shaped projection strip that is capable of being inserted into a space between an upper end periphery of a fixed window and a side body and has an engagement portion, and a second flat plate-shaped projection strip that is capable of being inserted into a space between a lower end periphery of the fixed window and the side body and has an engagement portion. The side body has a first engaging portion and a second engaging portion that are disposed in portions covered by the upper end periphery and the lower end periphery of the fixed window. The first and second engaging portions are respectively capable of engaging the first flat plate-shaped projection strip and the second flat plate-shaped projection strip.