PURPOSE: Provided is a self-propelled lawnmower having an improved structure and thus, to enhance rotatability of the lawnmower, facilitate lawn mowing performance and increase user's convenience. CONSTITUTION: The self-propelled lawnmower includes two lawn mowing blades(31) rotatably installed inside a mower deck(28), a grass discharge chute(33) at the center of the mower deck(28) for discharging grass to the rear side of the lawnmower, a saw-toothed driving pulley(44) disposed at the upper portion of the mower deck(28), a saw-toothed input pulley(54) located on a lawn mowing blade driving axis(15) that supports the two lawn mowing blades(31), and a saw-toothed belt(55) for winding around the driving pulley(44) and the input pulley(54).
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