Provided is a solid preparation in which the elutability and stability of a 6,7-unsaturated-7-carbamoylmorphinan derivative is improved. A solid preparation or a coated solid preparation, which comprises a 6,7-unsaturated-7-carbamoylmorphinan derivative, croscarmellose sodium and iron oxide and does not contain titanium oxide, can have an elution ratio of 85% or more 15 minutes after the start of an elution test and can also have improved stability, particularly photostability.
