The purpose of the present invention is to provide a nucleic acid medication for cancer treatment, the medication being capable of suppressing the growth of cancer stem cells and thus effectively treating cancer. hsa-miR-136-5p, hsa-miR-3065-3p, hsa-miR-4727-5p, hsa-miR-378g, hsa-miR-181a-5p, hsa-miR-362-5p, and hsa-miR-608 have remarkably excellent growth inhibitory action on cancer stem cells and are thus useful as a nucleic acid medication for the treatment of various cancers.