To provide a drainage panel which can enhance workability of a drainage structure such as a drainage wall structure or a drainage floor structure, the drainage structure using the drainage panel, and an execution method for the drainage structure.

In the drainage panel composed of a synthetic resin foamed plate, a backside has a drain gutter 11 which makes a drainage canal formed between the backside and a concrete skeleton. Characteristically, the drainage panel is provided with a groove 102 for a chamfer strip, into which the chamfer strip for fixing an interior finishing substrate material or an interior finishing material to a surface is fitted.