To provide a structure of a splashguard, which is easily attached to a jack and capable of preventing sludge and the like from entering the inside without deteriorating quality of appearance.

A recessed part 2 is formed to a position of a splashguard 1 corresponding to a jack attaching part. The recessed part 2 is installed only to a bottom face 1d of the splashguard 1, and has a notch part 3 obtained by notching an edge, and a pair of ribs 4, 5 separated in the front and rear directions of the notch part 3 and opposed to each other. The ribs 4, 5 are arranged adjacent to the notch part 3, and function to improve rigidity of the notch part 3 as well as to act as a guide at the time of attaching the jack. Due to the recessed part 2, an outer design of the splashguard 1 is not deteriorated, so as to fully secure a spacing s between the splashguard 1 and a jack arm part 7a. The notch part 3 has minimum dimension enough to accommodate a jack top 7b, so as to minimize admission of sludge and the like at the time of driving together with the ribs 4, 5 and a vertical wall part 6.