PROBLEM TO BE SOLVED: To embody a lawn mower which is high in energy saving effect by accurately grasping the running conditions, the working state, etc. when performing a lawn mowing work while running with a running electric motor via electric power generated by a generator powered by an engine.SOLUTION: This lawn mower is constructed to be capable of transmitting the driving force of an engine to a blade shaft 14 which supports the blade 54 of a mower deck 13, via a first electromagnetic clutch C1 from the PTO shaft on the side of the vehicle body 1, and is constructed to be capable of transmitting the driving force of the engine 27 to the generator 8 via a second electromagnetic clutch C2. The lawn mower is equipped with a work state detector S which detects whether it is in a lawn mowing state in which the blade 54 mows vegetating lawn grass or in a non-work state, and a controller 72 which engages the first electromagnetic clutch C1 and disengages the second electromagnetic clutch C2 when it detects the lawn mowing state, and disengages the first electromagnetic clutch C1 and switches on the second electromagnetic clutch C2 when it detects the non-work state.【課題】エンジン駆動の発電機により発電された電力を介して走行用電動モータで走行しながら芝刈作業を行う際に、走行条件、作業状態等を的確に把握して省エネルギ効果の高い芝刈機を具現しようとする。【解決手段】モーアデッキ１３のブレード５４を支持するブレード軸１４に車体１側のＰＴＯ軸から第１電磁クラッチＣ１を介してエンジン駆動力を伝動可能に構成し、前記発電機８にはエンジン２７の駆動力を第２電磁クラッチＣ２を介して伝動可能に構成し、前記ブレード５４が植生する芝草を刈り取る芝刈作業状態か、又は非作業状態かを検出する作業状態検出手段Ｓを備え、芝刈作業状態を検出すると、前記第１電磁クラッチＣ１を入とし第２電磁クラッチＣ２を切とし、非作業状態を検出すると、前記第１電磁クラッチＣ１を切とし第２電磁クラッチＣ２を入に切り替える制御部７２を備える。【選択図】 図３
