Abstract: A road cutting machine comprises a machine body (2) mounted to a travelling body (1) to be swivel, a boom (4) mounted to the machine body to be vertically swingable, an arm (6) mounted to the boom to be swingable in a vertical direction and a road cutting apparatus (A) mounted to the arm, the road cutting apparatus includes a mounting member (20) attached to the arm, a hydraulic motor (50) mounted to the mounting member and a cutting bit mounting member (99) rotated by the hydraulic motor and having a plurality of cutting bits, the cutting bit mounting member is provided with a main cutting bit (100) mounted to a center of rotation, a plurality of flat surface cutting bits (103, 104) attached in a range from the rotation center side to an outer periphery side, a plurality of sweep-cutting bits (105) attached on the outer periphery side and a plurality of side surface cutting bits (106, 107) attached on the outer periphery side, a bit tip end portion (100a) of the main cutting bit is positioned in a lowermost