An external fixation device 1 for fracture treatment for fixing a fractured affected limb B1 of a quadruped A is configured to include an almost toric ring portion 3 which is to put on periphery C of a shoulder joint and through which the affected limb B1 passes a supporting portion 4 having right/left walls and a back wall, having upper/lower surfaces and a front face opened, and accompanying the affected limb B1 from a radial head to a distal end of a metacarpal bone a connecting body 6 for connecting the rear of the ring portion 3 and the back wall of the supporting portion 4 a grounding body 7 being connected to the back wall of the supporting portion 4 and positioned below an opening of the lower surface of the supporting portion a fixing means 9 and an upper arm supporting section 10.
