PROBLEM TO BE SOLVED: To provide a novel immunostimulator and a novel immunotherapeutic agent.SOLUTION: An immunostimulator is made by a combination of (A) imiquimod or salt thereof, and (B) pyrrolidones represented by general formula (1), where R is a hydrogen atom or a 1-12C alkyl group.COPYRIGHT: (C)2014,JPO&INPIT【課題】新たな免疫賦活剤及び免疫療法剤の提供。【解決手段】(A)イミキモド又はその塩と、(B)下記一般式(1)で表されるピロリドン類とを組み合わせてなる免疫賦活剤。(式中、Rは、水素原子又は炭素数1~12のアルキル基を示す。)【選択図】なし