PROBLEM TO BE SOLVED: To provide metal fittings to allow pipe-shaped rails to be easily secured to vertical columns which form the framework of a vinyl greenhouse, so that the pipe-shaped rails enable a door body to be attached slidably left and right at the gateway of the vinyl greenhouse.SOLUTION: The metal fitting according to the present invention allows a door body to be installed slidably left and right at the gateway of a vinyl greenhouse, the metal fitting being characterized in that: rollers journaled to the door body are rollable on pipe-shaped rails laid at the gateway of the vinyl greenhouse； the metal fitting is constructed of a spacer mounting base frame and a bracket plate； when the pipe-shaped rails are laid at the gateway of the vinyl greenhouse, the bracket plate is vertically attached, via the spacer mounting base frame, to the left and right vertical columns installed vertically at the left and right of the gateway of the vinyl greenhouse； mating pieces of a fitting ring which is surroundingly mounted to the pipe-shaped rail are secured to the upper part of the bracket plate, holding the upper part of the bracket plate, so that the pipe-shaped rails can be secured to the left and right vertical columns.SELECTED DRAWING: Figure 8
