To provide a novel compound exhibiting antitumor activity by inhibiting the interaction between Mdm2 (murine double minute 2) protein and p53 protein. The present invention provides a dispiropyrrolidine derivative represented by the following formula (1) having various substituents that inhibits the interaction between Mdm2 protein and p53 protein and exhibits antitumor activity (wherein, R1, R2, R3, ring A, and ring B in 1) are as defined in the specification.Mdm2(murine double minute 2)タンパク質とp53タンパク質との相互作用を阻害し、抗腫瘍活性を示す新規化合物を提供すること。本発明は、Mdm2タンパク質とp53タンパク質との相互作用を阻害し、抗腫瘍活性を示す、各種置換基を有する下記式(1)で表されるジスピロピロリジン誘導体を提供する(ここで、式(1)中のR1、R2、R3、環Aおよび環Bは、それぞれ、明細書中の定義と同義である。)。