To provide a joint soil spreader allowing efficient introduction of the joint soil delivered with a conveyor belt into the great depth of the grain of lawn grass with a wide spreading width.

There is provided the joint soil spreader including: a travelable carriage having a front wheel and two rear wheels; a hopper provided over the rear wheels of the carriage, and housing the joint soil; a lower outlet provided on the lower side of the hopper; an annular conveyor belt for transporting the joint soil fed from the hopper through the lower outlet thereof, to the rear of the carriage; and a brush provided on the downstream side in the transporting direction of the conveyor belt, and spreading the joint soil transported by the conveyor belt. In the joint soil spreader, the conveyor belt is placed over the two rear wheels of the travelable carriage, and with a width extending over both of the two rear wheels, and the transporting direction of the conveyor belt is tilted on the axle of the two rear wheels so as to be lowered toward the rear of the carriage.