A cutting apparatus includes a base, a blade-holding arm mounted rotatably on the base, a blade mounted rotatably on the blade-holding arm and rotatable about an axis, and a light-emitting unit mounted on the blade-holding arm and adapted to project an image line on the workpiece. The light-emitting unit is movable in a transverse direction relative to the blade between a first position, in which the image line is disposed at a first lateral side with respect to the blade, and a second position, in which the image line is disposed at a second lateral side with respect to the blade.