PURPOSE: To facilitate attachment and detachment of the blower unit to increase the durability of the transmission mechanism by energizing the blower on the gear case side of the mower to drive the shaft.

CONSTITUTION: The output shaft 16 extending in the obliquely backward direction is connected through a bevel gear to the gear case for rotation and driving. The output shaft 16 is connected through a shaft transmission mechanism A comprising a couple of universal couplings 18, an intermediate shaft 20 which is supported with a plummer block 19 which is a bearing having aligning action and a coupling 21 to the inlet shaft 17 for driving the blades 13b. Thus, the power can be transmitted with improved durability and reduced transmission loss.