PROBLEM TO BE SOLVED: To provide a mounting bracket allowing for easily attaching a pipe-shaped rail to a vertical column constituting a framework member of a greenhouse, using the pipe-shaped rail provided to guide left-right slidably a door body attached to a doorway of the greenhouse.SOLUTION: A mounting bracket 27 includes a spacer mounting base frame 28 and a rail insertion fixing portion 29. When laying the pipe-shaped rail to the doorway of the greenhouse, the rail insertion fixing portion is erected on left and right vertical columns 4 erected on the right and left of the doorway such that: the axis of the rail insertion hole 81 formed in the rail insertion fixing portion through a spacer mounting base frame is oriented in a substantially horizontal direction； and the pipe-shaped rail is inserted into a rail insertion hole and the outer peripheral surface of the pipe-shaped rail is pressed and fixed by the rail fixing bolt 83 through a rail fixing female screw hole 82 formed in the rail insertion fixing portion and penetrating through the rail insertion hole； thereby allowing the pipe-shaped rail to be fixed to the left and right vertical column.SELECTED DRAWING: Figure 10
