To provide a weeding device and height adjusting structure capable of performing a weeding, a soil preparation, a mowing turf or grass, etc., with a single function or two functions simultaneously.

This weeding device is obtained by forming many projections on the rotary blade body and also inner blades among these projections and mounting the rotary blade to a reel-type weeding rotary body 6, and setting a flow separating body for separating a soil from grass by a centrifugation and a sieving means in a shallow plowing weeding device 1-2. In a mowing device, a stationary blade is made to be compact and exchangeable by using a rotating elastic supporting tool for supporting the stationary blade elastically and as rotatable, and different functions can be exhibited by changing the direction of air flow for removing weed by a changeover of a rotating door 50 and a rotating grass sweeping tool 14 and reversing of the rotating direction of the rotary weeding body. The functions of general mowing, that for weed in a turf, and both weeding in the turf and a shallow plowing weeding, etc., are performed by a single weeding device. Further, a notch insertion-type height adjusting structure enables the perfection of the achievements of the functions of the weeding devices and the position adjustment of a height or a degree of the inclination of various vehicles, devices and apparatuses fractionally.