A grass mower for cutting grass and collecting cut grass includes a main body, two handle brackets, a handle, a collector element, and two collector brackets. The main body is for cutting grass. The two handle brackets are oppositely mounted on lateral sides of the main body. The handle is coupled to the two handle brackets. The collector element is for collecting the cut grass. The collector element is defined by a frame, and the frame includes at least two limb elements located on substantially opposite sides of the collector element. The two collector brackets are respectively mounted to the two handle brackets and are configured to respectively accommodate the limb elements, wherein the collector element is mounted on the mower free from the handle.