<;P>;PROBLEM TO BE SOLVED: To provide a bracing structure for a greenhouse, which is appropriately arranged in an X shape state on a rectangular frame which is formed on a gable surface or a side of a greenhouse whose framework is made of metallic pipes, facilitating adjustment of a length of diagonal bracings, and inexpensive and easy to construct. <;P>;SOLUTION: This bracing structure for the greenhouse is constituted by gusset plates 2 which are welded to the side of single clamps 1 to be each externally engaged and fixed to metallic pipes or the outer surface of the metallic pipes, near each corner part of the frame of the metallic pipes forming a rectangular frame, and metallic pipe members 3 and 4 which has different diameters and whose one ends 3a and 4a are pressure processed to be made flat are fixed to the gusset plates 2 opposite on an almost diagonal line of the frame, and a pipe connecting tapping screw 5 which are threadedly inserted from the outer surface of the metallic pipe member 4 which has a large diameter in a condition of inserting the other end of the metallic pipe member 3 which has a small diameter into the other end of the metallic pipe member 4. <;P>;COPYRIGHT: (C)2009,JPO&INPIT