With respect to antibodies for cancer treatment, anti-CD43 antibodies that bind to the extracellular region of CD43, anticancer compositions containing these as active ingredients, compositions for inhibiting cancer stem cells, and methods for screening cancer stem cell inhibitors are provided.癌治療用抗体に関し、CD43の細胞外領域に結合する抗-CD43抗体、これを有効成分として含む抗癌組成物、癌幹細胞阻害用組成物、および癌幹細胞阻害剤のスクリーニング方法が提供される。