A riding work vehicle includes an engine hood provided at a rear portion of the vehicle body, an engine cooling air inlet provided at a front end area of the engine hood, and a mower connecting portion for connecting a mower to the vehicle body. A pair of right and left first fenders are supported to the vehicle body so as to be located above the front wheels or rear wheels. Second fenders are provided separately from the first fenders and overlapping at least partially with the first fenders as viewed from above. Second fender support portions support the second fenders to the vehicle body. Each one of the second fenders includes an overlapping portion overlapping with the first fender as viewed from above and a dust cover portion disposed laterally of the engine cooling air inlet.