PROBLEM TO BE SOLVED: To provide a reaping height adjusting mechanism for a lawn mower in which the loss of a spacer can be prevented and a reaping height can be adjusted smoothly.SOLUTION: A reaping height adjusting mechanism for a lawn mower includes multiple lawn mower units independently following to the slope of a lawn surface. The lawn mower unit has a deck frame with multiple rollers, and a cutting blade deck disposed inside the deck frame and receiving a cutting blade rotating on the vertical shaft in the inside thereof. A connection bracket is fixed in multiple places of an outer peripheral edge of the cutting blade deck, and the connection bracket includes a horizontal flange part being bent in the right angle toward the outside and disposed on the upper surface of the deck frame. Multiple rotatable spacers are interposed between the horizontal flange part and the deck frame centering on the support shaft disposed on the upper surface of the deck frame.SELECTED DRAWING: Figure 1
