There are provided an injection molding composition capable of being injection-molded easily at a temperature lower than that of a conventional composition, as well as an injection molded product having improved strength. More specifically, there is provided an injection molding composition containing HPMCAS having a hydroxypropoxy molar substitution of 0.40 or more. In addition, there is provided a method for producing an injection molded product including a step of injecting into a mold the injection molding composition at from 50 to 250°C.
