PROBLEM TO BE SOLVED: To enable a concrete secondary product to be installed stably even when the installation surface is an inclined surface.SOLUTION: An installation structure of a concrete secondary product includes: a concrete secondary product 1 having a fitting hole 11 formed on a bottom plate 12, the fitting hole oriented in a vertical direction when the concrete secondary product is installed on an inclined surface 40; a support member 2 inserted into the fitting hole 11 of the concrete secondary product 1 and supporting the concrete secondary product 1 in the vertical direction when installed on the inclined surface 40; and an installation base member 3 having an undersurface that inclines at an angle corresponding to the inclined surface 40 when the secondary concrete product is installed on the inclined surface 40, and a top surface functioning as a horizontal surface to support the support member 2.SELECTED DRAWING: Figure 2
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