PROBLEM TO BE SOLVED: To solve a problem caused when forming a wide ridge wider than the tilling width on a tillage soil surface tilled by the tilling claw rotor mounted at the rear side of a tractor by using a wing hiller or a ridger, etc., in which the wing hiller is mounted at the rearward of a tractor and the ridging work is performed at wide intervals as a process independent from a tilling process, so that many working processes are required and it is inefficient.SOLUTION: A wide ridge forming apparatus is characterized by: disposing a single wing hiller 3 forming one side ridging plate 2 for ridging the soil grooved and ridged to a tilling width inside, at one end of right and left sides in the rear side of a tilling claw rotor 1 for tilling a soil surface of a predetermined width and providing a pressing plate 4 extended and formed at the rear of the one side ridging plate 2 in the rear of the single wing hiller 3, and sliding and pressing a ridging slope surface ridged by the one side ridging plate 2.
