PROBLEM TO BE SOLVED: To provide a self-propelled working robot capable of accommodating to work at a place from a narrow place to a wide working range and, even when breadth of a working object surface is changed, capable of suppressing lowering of working efficiency.SOLUTION: A self-propelled working robot 1 performs work while autonomously traveling a working object surface, and comprises a plurality of machine bodies A, B, C each including a working tool on a lower surface and a pair of driving wheels on both sides. The plurality of machine bodies are serially connected by connecting members 2, 3, and adjacent machine bodies are relatively rotatably connected along the working object surface by the connecting members 2, 3. Each of the machine bodies A, B, C includes: a drive part for driving the respective driving wheels； a control unit for controlling the drive part； and a plurality of obstacle detection sensors provided on the outer peripheral surface. When detecting an obstacle in front of the traveling direction by the obstacle detection sensor, each machine body travels a movement trajectory or a movement-predicted trajectory of another machine body in which no obstacle is detected in front of the travel direction.SELECTED DRAWING: Figure 1
