PROBLEM TO BE SOLVED: To provide a structural material which is used for agriculture and horticulture, scarcely stores water therein, can easily hold a plastic sheet, or the like, does not distort when used as a trestle for a long period, can easily be set as a support member on which crop-leading lines are disposed to lead the crops, and can easily be produced, and to provide a method for producing the same. SOLUTION: This structural material 1 which is useful for agriculture and horticulture, has an approximately cylindrical shape, and is used for the frame of a green house, or the like. A slit 2 is formed in the peripheral wall in the axial direction.
