To provide a synthetic resin molded product which can be realized even in a small-scale regional unit and is easy to recycle the raw material (resource circulation), and its recycling method.

The synthetic resin molded product is composed of a polyacid anhydride of an aromatic dicarboxlyic acid and is decomposed into a single dibasic acid aqueous solution by hydrolysis to which an acid is then added to deposit a monomer constituting the polyacid anhydride, and thus can be recycled to the raw material of the synthetic resin molded article. As the aromatic dicarboxylic acid, for example, di(4-carboxy-2-methoxyphenoxy)-α,ω-ethane which can be synthesized by using lignin acid and ethanol obtained by the fermentation of starch as a raw material is suitably used. The synthetic resin molded product is expected to be utilized for automotive interior finishing materials, medical expendable supplies and the like.