A robot for the repair of sewer pipes comprises a carriage unit driven by a traction motor (2) arranged internally of a carriage housing (1) with wheels (7,9). The carriage housing (1) is connected to a rotary head (15) arranged immediately before the carriage housing (1). The rotary head (15), having tools and/or inspection devices mounted thereon, is driven by rotary motor (22). The traction motor (2) and the rotary motor (22) are arranged in a mutually overlapping relationship. The rotary head (15) is connected to a hollow shaft (23) extending through the whole carriage housing (1). The rotary head (15) is adapted for attachment of a robot arm carrying a tool support. A swivel arm of the robot arm as well as the tool support can be swiveled by hydraulic cylinders. The end of the robot arm facing away from the rotary head (15) is provided with a support wheel.