To ensure strength and simply fix diagonal members such as an angle rafter and the like on a purlin and the like without working the purlin and the like by twisting the center of a strip-like plate made of metal plate by a specified angle in the horizontal direction, fixing the lower side on the side face of the purlin and fixing the upper side on the side face of the angle rafter by a machine screw respectively.

The lower half of a fixing fitting formed into planar view substantially fan shape is made a fixing part 7 fixed on the side face of purlins 1, 15 by twisting the center part of a strip-like metal plate made metal up to 45 degrees in the horizontal direction, and an upper half is made a fixing part 8 fixed on the side face of an angle rafter 4. The fixing parts 7, 8 are fixed by machine screws 11 inserted in machine screw holes bored in the fixing parts 7, 8. With regard to a fixing fitting 5, two kinds of left use of the state in which the direction of the fixing part 8 is changed in 45 degrees clockwise for the fixing part 7 and right use of the state in which on the contrary the direction is changed in 45 degrees counterclockwise are prepared, and both the side faces of the angle rafter 4 can be connected to the purlins 1, 15 through the fixing fitting 5.