Abstract: A sawing path indicating circular saw includes a circular saw blade rotatably mounted on a saw blade shaft about a blade axis and having left and right major surfaces and a blade edge periphery, a seat member disposed on the saw blade shaft adjacent to the left major surface and rotated with the saw blade shaft, and an illuminating unit disposed on the seat member. Light emitted from the illuminating unit is directed radially and outwardly to project on a light reflecting area of the blade edge periphery and is reflected by the left major surface so as to create a bright region and a dim region on a surface of a workpiece, thereby forming a sharp demarcation line to indicate a sawing path of the saw blade.