To take a boring device capable of simply and energy conservatively eliminating boring dust from a boring tool and driving torque out of a boring string in a ground bore hole.

A hose 15 is held by a boring string 13 to prevent its rotation, a pump stator 30 can be flushed against the hose 15, and when the hose 15 is rotated together with the boring string 13, a stator arm 32 having the pump effect caused by rubbing the hose 15 is provided. A torque support 40 can be moved to the boring string 13 in the direction of the vertical axis, at least three holders having at least one rotatable roller body every each holder are provided, and the torque support 40 is fixed in the ground bore hole 20 by pushing the holders against the radial outside by a compression device.