To simultaneously and efficiently perform leveling and cleaning of the ground and adjustment of sand grains to a fixed size while pulling a ground maintenance implement at increased speed, with relatively small force, coping with various ground states.

A filter has a rectangular net 2 at its bottom face; a scooping plate 7 mounted extending horizontally or obliquely frontward or obliquely downward from one long side of the net 2 and having a horizontal part at the tip; side plates 44 and a long side plate 6 provided at the other three sides; and a leveling roller 3 or a leveling brush roller 13 rotatably journaled between both side plates 4, 4 extended backward. The rear end parts of both support plates 9, 9 extending to the front side of the scooping plate 7 are mounted to the front end parts of both side plates 4, 4, and two wheels 18, 18 are rotatably provided at the front end parts of both support plates 9, 9.