Abstract: A grass catcher adapted to be detachably secured to a mower deck of a lawn mower which comprises a frame structure whose top and front frames are pivotally connected with each other. Lateral frame members are also pivotally connected at their inner ends to the front frame while their outer ends are adapted to be threadably secured to the rear area of the top frame. The hinged connections permit folding-together of the frame structure into a relatively flat package to reduce space requirements during shipping and storage.