The present invention relates to a diclofenac sodium oral pharmaceutical containing diclofenac sodium, a nonionic surfactant, a cholic acid derivative as an absorption promoting agent, and a glycerin or a glycol. The oral pharmaceutical has a rapid-acting effect and a good internal absorption even under non-fasting condition. Further, the pharmaceutical can be processed in a hard capsule pharmaceutical by filling it in a hard capsule as such, and has an excellent internal absorption under non-fasting condition, similarly to suppositories.