A weld bead-shaping device is provided. The device comprises: a gouging torch (13) for gouging the object being shaped; a shape sensor (14) that measures the shape of the object being shaped; a slider device (11) and multi-jointed robot (12) that drive the gouging torch (13) and the shape sensor (14); an image-processing device (16); and a robot control device (17). The image-processing device (16) comprises: a shape data-extracting unit that extracts the shape data for the object being shaped from the measurement results of the shape sensor (14); and an excess weld shape-extracting/removal depth-calculating unit that calculates the excess weld shape for the weld bead from the difference between the shape data and a previously established specified shape for the object being shaped and calculates the gouging removal depth based on the excess weld shape. The robot control device (17) controls the slider device (11), the multi-jointed robot (12) and the gouging torch (13) on the basis of the excess weld shape and removal depth. The configuration provides the weld bead-shaping device capable of shaping weld beads with high precision.