Provided is a novel potent pharmaceutical composition for treating nociceptive pain. The present invention relates to a pharmaceutical composition for treating nociceptive pain, containing a morpholine derivative or a pharmaceutically acceptable salt thereof, as an active ingredient. The present invention is useful in providing an excellent pharmaceutical composition for treating nociceptive pain. In addition, the present invention is particularly useful in providing a pharmaceutical composition for treating pain accompanying a disease selected from the group consisting of rheumatoid arthritis, rheumatoid spondylitis, osteoarthritis, spondylosis deformans, gouty arthritis, juvenile arthritis, scapulohumeral periarthritis, and cervical syndrome, lumbago, lumbago accompanying spondylosis deformans, menalgia, pain and tumentia after inflammation, operation or injury, pain after odontectomy, and cancer pain. In addition, the present invention is particularly useful for alleviating pain in a damaged cartilage region, and is particularly useful for osteoarthritis in which NSAIDs are not effective.
