PURPOSE: To provide a standing device for a tractor working machine which is linked to the rear part of the tractor as freely attachable and detachable, not necessitating an adjustment by a tool bar as conventional devices when supporting the working machine with a standing device at a posture for its attaching or detaching and also preventing the working machine from a rotation centering around the standing device.

CONSTITUTION: This standing device for a tractor working machine is constituted by installing a standing device 17 for supporting the working machine 2 and used in the case of attaching or detaching the working machine 2 at the rear of a chain case 10 arranged at one side of the working machine 2 and is capable of changeably taking a supporting position where a stopper 22 installed at the standing device 17 is rotated to the lower direction and protruded to the side of the working machine 2 for limiting the rotation of the working machine, and an accommodating position where the stopper is rotated in the upper direction by retreating from the side of the working machine 2 for canceling the limitation.