PROBLEM TO BE SOLVED: To provide a fused heterocyclic compound, a salt thereof, and a pest control agent containing the compound as an active ingredient. A compound represented by the following general formula (1), for example, 2-[3-(ethylsulfonyl)-7-(trifluoromethyl)imidazo[1,2-a]pyridin-2-yl]-7-( Trifluoromethyl)imidazo[1,2-c]pyrimidine. In formula (1), D is a ring represented by any of D1 to D3 and Q is a ring represented by any of Q1 to Q4. [Selection diagram] None【課題】縮合複素環化合物及びそれらの塩、並びに該化合物を有効成分として含有することを特徴とする有害生物防除剤の提供。【解決手段】下記一般式（１）の化合物、例えば、２－［３－（エチルスルホニル）－７－（トリフルオロメチル）イミダゾ［１，２－ａ］ピリジン－２－イル］－７－（トリフルオロメチル）イミダゾ［１，２－ｃ］ピリミジン。式（１）中、ＤはＤ１～Ｄ３の何れか、ＱはＱ１～Ｑ４の何れかで表される環。【選択図】なし
