PROBLEM TO BE SOLVED: To provide a walk-behind work machine in which it is easy to avoid a situation in which rust occurs between a drive shaft and a tubular shaft portion. SOLUTION: The drive source, a drive shaft D1 made of metal that is rotationally driven by the drive source, and a tilling part C1 that is connected to the drive shaft D1 in a removable state, the tilling part C1 includes: It has a tubular shaft portion 7 made of metal and a tilling claw that is supported by the tubular shaft portion 7 and extends radially outward from the outer peripheral portion of the tubular shaft portion 7, and the tilling portion C1 is a tube. When the drive shaft D1 is inserted into the cylindrical shaft portion 7, it is configured to rotate integrally with the drive shaft D1, and in the state where the drive shaft D1 is inserted into the tubular shaft portion 7, the outer periphery of the drive shaft D1 is A rust resistant member 13 is interposed between the portion and the inner peripheral portion of the tubular shaft portion 7. [Selection diagram] Fig. 3【課題】駆動軸と、筒状軸部と、の間に錆が生じる事態を回避しやすい歩行型作業機を提供する。【解決手段】駆動源と、駆動源により回転駆動される金属製の駆動軸Ｄ１と、駆動軸Ｄ１に対して抜き差し可能な状態で連結される耕耘部Ｃ１と、を備え、耕耘部Ｃ１は、金属製の筒状軸部７と、筒状軸部７に支持されると共に筒状軸部７の外周部から径方向外側へ延びる耕耘爪と、を有しており、耕耘部Ｃ１は、筒状軸部７に駆動軸Ｄ１が挿入された状態で、駆動軸Ｄ１と一体回転するように構成されており、筒状軸部７に駆動軸Ｄ１が挿入された状態において、駆動軸Ｄ１の外周部と、筒状軸部７の内周部と、の間に、耐錆部材１３が介装されている。【選択図】図３
