The fixing metal fitting including: a joint base in groove shape mainly composing a joint metal; a cover spacer in groove shape capable of supporting the pillar's axial load by covering the joint base, wherein joint base including: a plane section in rectangular shape coinciding with an end surface of the pillar; a pair of groove walls bent vertically in L shape; and a joining plate standing from the plane section and supported by welded part J contacting at least the pair of groove walls or groove bottom, wherein the cover spacer including: a plane section in rectangular shape for supporting pillar by abutting to the pillar's end surface; a pair of groove walls composed of side edges of plane section respectively bent vertically in L shape; and a slit drilled such that the joining plate will be fitted into slit when the cover spacer is covering the joint base.