PROBLEM TO BE SOLVED: To obtain a walk behind lawn mower that can easily perform mowing work of the ground around an obstacle.SOLUTION: A walk behind lawn mower includes a machine body 3 with a first mowing unit 11. A support frame is supported on the machine body 3 in a swinging manner around a vertical axis core P2 in the vertical direction, and is extended to the horizontal outside intersecting with the traveling direction B of the machine body 3 in a plan view. The walk behind lawn mower includes a spring mechanism 33 for biasing the support frame to the horizontal outside, and a positioning unit 35 for stopping the swinging to the horizontal outside of the support frame in a predetermined position A. A second mowing unit 12 is supported in an extending portion of the support frame.SELECTED DRAWING: Figure 4【課題】障害物の周囲の地面の草刈作業を容易に行うことができる歩行型草刈機を得る。【解決手段】第１草刈部１１を備えた機体３を備える。支持フレームが上下方向の縦軸芯Ｐ２周りに揺動自在に機体３に支持されて、平面視で機体３の進行方向Ｂと交差する横外側に延出される。支持フレームを横外側に付勢するバネ機構３３と、支持フレームの横外側への揺動を所定位置Ａで止める位置決め部３５とを備える。支持フレームの延出部分に、第２草刈部１２を支持する。【選択図】図４
