The purpose of the invention is to suppress occurrences of excessive or insufficient excavation volumes with respect to a volume limit without relying on excavation distances while reducing the load on an operator who is producing a target face. A control device 40 for a hydraulic shovel 1 is provided with: an estimated excavation volume computing unit 43f that calculates an estimated excavation volume Va defined by a bucket claw tip position at the start of excavation (first position), a bucket claw tip position at the end of a preset excavation time (second position), the current geography 800, a first target face 700, and a bucket width w; and a target face generation unit 43g that generates a second target face 700A above the first target face when the estimated excavation volume Va exceeds a volume limit Vb. The target face generation unit generates the second target face in a position where an excavation volume defined by the first position, the second position, the current geography, the second target face, and the bucket width approaches the volume limit Vb. The control device controls hydraulic actuators 5, 6, 7 so that the movement area of a work machine 1A is limited tothe second target face and above same.