A counterweight (9) provided on the rear side of an upper turning body (3) is formed as a block member in which the boundary between a rear face (9B) and a top face (9C) is a convex curved face (9E) that is curved in a convex arc shape. A rear camera device (11) mounted on the top face (9C) of the counterweight (9) is on the top face (9C) of the counterweight (9) and is disposed to project to the rear toward the convex curved face (9E) of the counterweight (9). A cover member (19) is provided to cover a gap (18) formed by the convex curved face (9E) between the convex curved face (9E) of the counterweight (9) and the rear portion of a bottom face (12F) of a mounting plate (12) of the rear camera device (11).
