The object of the present application is to provide an efficient analgesic agent for preventing or treating various pain disorders. The present application provides an analgesic agent comprising a fatty acid ester having a number of carbon atoms of 10 as an active integredient. The analgesic agent of the present application comprising the compound as an active integredient can be efficiently used as a therapeutic agent for treating various pain disorders, for example, a prophylactic or therapeutic agent for pain causing from osteoarthritis such as knee osteoarthritis or femur osteoarthritis, and demyelinating diseases such as multiple sclerosis and Guillain-Barre Syndrome.本發明之目的係提供一種在預防或治療各種疼痛疾病方面有效的鎮痛劑。本發明係提供一種含有碳數為10之脂肪酸酯作為有效成分之鎮痛劑。以該化合物作為有效成分之本發明鎮痛劑係於作為針對各種疼痛疾病之治療劑，例如，由變形性膝關節炎或變形性股關節炎等變形性關節炎、多發性硬化症或格林巴利症候群等脫髓鞘性疾病等所引起之疼痛的預防或治療劑具有高度應用性。
