A weeding device is configured in such a manner that a first comb body in which a plurality of comb blades are arranged side-by-side on a coupling rod in a comb shape, and a second comb body having the same configuration as that of the first comb body are stacked so as to form one comb blade unit, that both ends of a plurality of the comb blade units are fastened on the same circle of the rotating center of a pair of rotating plates so as to form a comb blade unit rotating body, that the coupling rod of the first comb body and/or the second comb body is pressed toward the longitudinal direction to project a projection piece to the outside of the rotating plates, that the projection piece is depressed by guide plates located on the outside of the rotating plates along with the rotation of the comb blade unit rotating body, and the comb blades are brought into contact with one another or come close to one another to sandwich the grasses that are growing therebetween, and that the sandwiched grasses are pulled out along with further rotation of the rotating plates. With this configuration, the device which is capable of efficiently pulling out the weeds that are growing in a field or a garden together with the roots, capable of easily being used even at home because of a simple mechanism, and capable of further being used as part of the device such as a weeder or a crop harvester is provided.
