To provide a self-propelled work machine which prevents damage in a work part and a mowing blade part due to collision, which continues work, and which improves visibility of an operator from the front, the back and above.SOLUTION: A self-propelled mowing machine 1 includes: a body part 2； travelling parts 3 provided on left and right sides in the travelling direction of the body part 2, and having a travelling motor 31 for driving and travelling； and a work part 4 positioned in front of the body part 2 and the travelling part 3, and for performing work. The self-propelled mowing machine 1 also includes: a protective member 62 arranged at the front part and the side part of the work part 4, and for protecting the front part and the side part of the work part 4； and guide wheels 63 which are arranged on both left and right sides in the travelling direction on the front side of the work part 4, and in which part of the circumference is made to protrude from the side of the work part 4.SELECTED DRAWING: Figure 1【課題】衝突による作業部及び刈刃部の損傷を防ぐと共に、作業を継続させ、さらに、前方及び後方及び上方の作業者への視認性を向上させる自走式作業機を提供すること。【解決手段】自走式草刈機１は、本体部２と、本体部２の進行方向左右側に設けられ、駆動走行をさせる走行モータ３１を有した走行部３と、本体部２及び走行部３の前方に位置し、作業をするための作業部４と、を備える。自走式草刈機１は、さらに、前記作業部４の前方部および側方部に配置され前記作業部６の前方と側方を保護する保護部材６２と、作業部４の前方側の進行方向左右両側に配置され、作業部４の側方から円周の一部を突出させた案内輪６３と、を備えた。【選択図】 図１
