To provide a civil engineering pile body low in cost, volume, and weight, easily transportable, providing no rust, and high in strength and safety.

In this synthetic resin pipe body for civil engineering, plate-like bodies 5a and 5b having lower edges 6a and 6b formed in inclined faces raising toward tips and upper edges 7a and 7b connected to the upper end 8 or a part slightly lower than the upper end 8 of a bar-like part 2 are arranged continuously with the upper part of the bar-like part 2 on both sides of the bar-like part 2 along the longitudinal direction of the bar-like part 2 to form wing-like parts 3a and 3b. A conical body having a width in cross section increasing toward an upper part is arranged continuously with a lower part to form an arrow-like part 4.