To enables the production of a plastic product which excels in ultraviolet absorbing power and is transparent.

A composite ultraviolet absorber is added to a plastic as a material in producing a transparent ultraviolet absorbing plastic product, and comprises at least one antioxidant agent which is liquid at normal temperatures, a hindered amine light stabilizer, and an ultraviolet absorber, and a crystalline or powdered ultraviolet absorber which is solubilized by heating and mixed into the above agent.