<;P>;PROBLEM TO BE SOLVED: To provide an analgesic using a sodium channel inhibitory peptide. <;P>;SOLUTION: The analgesic includes an SKTX peptide which is represented by sequence numbers 1-3, derived from Strumigenys kumadori, and has sodium channel inhibitory activity or a peptide analogous thereto or derivative thereof as an active ingredient. <;P>;COPYRIGHT: (C)2010,JPO&INPIT