PROBLEM TO BE SOLVED: To provide a weed-proof structure in which discharge destination and outflow of rain water due to rain fall can be intentionally changed using inclination of the ground according to a design of a constructor.SOLUTION: A weed-proof structure 100 is so configured that a plurality of weed-proof sheets A adjacent in the respective vertical/lateral arrangement directions (X and Y) are joined with each other (for example, A1 and A2, A2 and A3, A3 and A4 and the like), where each of the weed-proof sheets has first side edge pieces, a second side edge piece, and a third side edge piece that are so formed as to integrally continue respectively from all of respective upper/lower ends in the longitudinal direction (X) and right/left ends in the width direction (Y) of a rectangular sheet body 1. Joining parts 102b of the backside faces of the facing side edge pieces of the weed-proof sheets (for example, A1 and A2, A2 and A3, A3 and A4 and the like) adjacent in the respective vertical/lateral arrangement directions X and Y, project upward in the width direction of the rectangular sheet body 1 by the projection height of 10 mm or more and extend in the direction (X) orthogonally to the arrangement direction (Y).SELECTED DRAWING: Figure 1
