It is an object of the present invention to provide a solid pharmaceutical composition, which can suppress a reduction in the content of an active ingredient caused by decomposition of rapamycin or a derivative thereof due to light irradiation, can ensure long-term stability, and has high storage convenience. In the present invention, the inventors have found that a preparation comprising rapamycin or a derivative thereof wherein a iron oxide is dispersed in the preparation can ensure light stability of the active ingredient, thereby completing the present invention. The present invention relates to a solid pharmaceutical preparation comprising rapamycin or a derivative thereof and iron oxide, wherein the iron oxide is dispersed in the solid pharmaceutical preparation.