To provide a self-propelling treatment machine capable of realizing the attachment and detachment of a work device with respect to a main body frame without requiring the difficult moving operation of the self-propelling treatment machine.

The self-propelling treatment machine is equipped with a propelled body 1, the main body frame 3 arranged on the propelled body 1, the treatment device capable of treating a treatment target, for example, a crusher 6 and a power unit 7, the work device detachable with respect to the main body frame 3 and enabling the treatment work of the treatment target, for example, a conveyor device 10 and an attaching and detaching mechanism 8 for attaching and detaching the conveyor device 10 with respect to a main body 2. The conveyor device 10 has at least three support legs and the wheels respectively mounted on the lower ends of those support legs. Each of the support legs is constituted of the first support leg 11 arranged on one side of the conveyor device 10 and the second leg 12 arranged on the other side of the conveyor device 10.