PROBLEM TO BE SOLVED: To provide an antimalarial agent having high antimalarial activity (especially, effective even against chloroquine-resistant malaria parasites) and high safety, and an anticancer agent having high antitumor activity and low toxicity for non-tumor cells.SOLUTION: Provided are an antimalarial agent and an anticancer agent comprising an indolo [3,2-c] quinoline derivative (A) represented by the following formula (A) or a pharmaceutically acceptable salt thereof as an active ingredient. In the formula (A), Rrepresents a prescribed substituent such as a halogen atom or the like; Rrepresents a prescribed substituent such as an aminoalkylamino group or the like; Rrepresents an alkyl group; Rrepresents a prescribed substituent such as a halogen atom or the like; n represents an integer of 1 to 4; and m represents an integer of 0 to 4.【課題】抗マラリア活性が高く(特にクロロキン抵抗性のマラリア原虫にも有効であり)かつ安全性の高い抗マラリア剤、および抗腫瘍活性が高くかつ非腫瘍細胞に対する毒性の低い抗がん剤を提供する。【解決手段】下記式(A)で表わされることを特徴とするインドロ[3,2-c]キノリン誘導体(A)またはその製薬学的に許容される塩を有効成分として含有することを特徴とする、抗マラリア剤および抗がん剤。式(A)中、R1はハロゲン原子等の所定の置換基、R2はアミノアルキルアミノ基等の所定の置換基、R3はアルキル基、R4はハロゲン原子等の所定の置換基を表し、nは1~4の整数、mは0~4の整数である。【選択図】なし