To solve problems of a risk of an operator caught with a rotating blade or injured by touching the rotating blade during maintenance because the rotating blade of a spreader is changed into an uncovered state and protruded from a casing of an apparatus for treating waste culms when the apparatus for treating the waste culms is opened for performing the maintenance, etc., in a conventional apparatus for treating the waste culms.

The apparatus for treating the waste culms is composed by mounting the apparatus 1 for treating the waste culms in which an operation part 10 such as a cutting apparatus is housed freely rotatably in the horizontal direction from a body of a harvester 20, opening the side of an inlet for the waste culms of the casing 2 of the apparatus 1 for treating the waste culms and openably and closably mounting a safety cover 5 covering the operation part 10 on the side of the inlet for the waste culms. A restraining mechanism designed not to close the rear of the body of the harvester 20 with the front of the apparatus 1 for treating the waste culms is installed on the side of the apparatus 1 for treating the waste culms in a state of covering the operation part 10 with the safety cover 5 in the constitution of the apparatus.