To provide an upright strut setting method capable of simply and firmly setting up an upright strut 6 of a fence or the like on a slant ground 3 and almost dispensing with removal back fill surplus soil.

A strut board 2 having an elongated hole 1 bored in the central area is exposed on the inclined ground 3 with the top face 2' inclined substantially parallel to the ground 3, and buried with the longitudinal direction of the elongated hole 1 arranged in the direction of inclination, soil 5 in a strut supporting pipe 4 buried in the ground 3 is consolidated in the erecting direction along the elongated walls 1', 1' of the elongated hole 1, the lower end part 6' of the strut 6 is inserted in a space s formed on the upper part of the pipe 4 by consolidation, and mortar 7 is filled between the outer periphery of the lower end part 6' and the inner periphery of the space, and cured and set.