PROBLEM TO BE SOLVED: To provide a ridge-forming device that secures a groove bottom width while being the simple ridge-forming device, and besides, can tighten a slope face.SOLUTION: A ridge-forming device 70 is configured such that a bottom surface of a groove of a ridge spacing and a slope face of a ridge are shaped using a lower side and a side end edge of an elastic bendable shaping plate 74 moving on the trail tilled by a tilling device 10, and also includes a plate-like support frame 73 for supporting the shaping plate 74 at the downstream side in the traveling direction of the shaping plate 74. A lateral direction mid-plane 73a perpendicular to the moving direction is provided in the support frame 73. The mid-plane 73a is wide at the side of a lower side and narrow at the side of an upper side. The lower side of the shaping plate 74 shapes the bottom surface of the groove. Both side planes 73b inclined to the downstream side in the moving direction as becoming outside are provided in both outer sides of the mid-plane 73a perpendicular to the moving direction of the support frame 73. The shaping plate 74 where the side end edge of both side planes 73b is positioned shapes the slope face of both sides of the groove.SELECTED DRAWING: Figure 5【課題】簡易な畝立器でありながら、溝底幅を確保しなおかつ法面を締める事が可能となる畝立器を提供しようとする。【解決手段】耕うん装置１０で耕うんした後を移動する弾性屈曲可能な整形板７４の下辺および側端辺とで畝間の溝の底面および畝の法面を整形するよう構成するとともに、整形板７４を支持する板状の支持枠７３を整形板７４の進行方向下手側に備える畝立器７０であって、前記支持枠７３には移動方向と直交する左右方向の中央平面７３ａを設け、該中央平面７３ａは、下辺側が幅広で、上辺側が幅狭とし、整形板７４の下辺が溝の底面を整形し、支持枠７３の移動方向と直交する中央平面７３ａの両外側には、外側になるに従って移動方向下手側に傾斜する両側平面７３ｂを設け、該両側平面７３ｂの側端辺が位置する整形板７４は、溝両側の法面を整形する。【選択図】図５
