Abstract: A new grass catcher for mounting to a riding mower to collect mowed grass. The inventive device includes a container member having a front opening of the container member into the interior space of the container member. A front cover panel mountable to a riding lawn mower is provided for substantially covering the front opening of the container member. A support frame assembly pivotally couples the top panel of the container member to the top edge of the front cover panel. The front cover panel has a passage hole therethrough designed for extending one end of a grass chute of a lawn mower therein to permit passage of lawn clipping from the cutting blades of the lawn mover to the interior space of the container member.