PROBLEM TO BE SOLVED: To provide a composition for preventing, improving or treating diabetes and/or diabetic nephropathy.SOLUTION: The composition for preventing, improving or treating diabetes and/or diabetic nephropathy comprises the extract of Vitex agnus-castus.COPYRIGHT: (C)2012,JPO&INPIT【課題】糖尿病および/または糖尿病性腎症の予防、改善または治療用組成物を提供する【解決手段】セイヨウニンジンボクエキスを含有する糖尿病および/または糖尿病性腎症の予防、改善または治療用組成物【選択図】図1