[Problem] To provide a hard-to-fall self-propelled mower which has a relatively simplified structure and an adjustable mowing width, is usable for a curved slope face, and enables a pruning work at a high place.[Solution] A self-propelled mower includes a self-propellable mover main body at least one of a battery, an electric generator, and an engine, provided inside a protruding wing that protrudes sideward from sides of the mover main body, the protruding wing being retractable and an extension length of the protruding wing being variable a plurality of mowing units provided protruding from a front face of the mover main body and a front face of the protruding wing, each including a movable blade that reciprocates or rotates to cut grasses driven by an electric motor or the engine, provided in the self-propellable mover main body, the electric motor being powered by the battery or the electric generator. The mover main body moves on a slope face while being towed, via a traction rope, by a straddle-type mover body that moves straddling on a guard rail installed on a top of a slope of a bank or moves on the ground or in the air while being suspended by a suspension rope hung from a spanning cable spanning in the air.
