An oligopeptide having a good anti-inflammation effect on microglia has been found, and based on this finding, a composition to be used for suppressing the inflammation of microglia is provided. Inflammation suppression action of a dipeptide has been comprehensively analyzed using the proinflammatory cytokine production of microglia as an indicator. As a result, it has been revealed that an oligopeptide including the sequence LH, DV or MH has a good inflammation suppression effect. The composition containing any of these oligopeptides can provide a composition having the effect of suppressing the excessive inflammatory action of microglia.