PROBLEM TO BE SOLVED: To provide an MRI contrast agent capable of expressing high effect with a small quantity.SOLUTION: The invention provides an MRI contrast agent having a compound in which an electron-donative organic silicon group is added to La2@C80.COPYRIGHT: (C)2015,JPO&INPIT【課題】少量で高い効果を発現可能なMRI造影剤を提供する。【解決手段】La2@C80に電子供与性の有機ケイ素基が付加した化合物を有するMRI造影剤。【選択図】図1