PROBLEM TO BE SOLVED: To provide a novel anti-HCV agent.SOLUTION: The invention relates to an anti-HCV agent containing mono-L-aspartyl chlorin e6 (NPe6) or a pharmaceutically acceptable salt thereof as an active ingredient. The anti-HCV agent of the invention shows the equivalent anti-HCV action as compared with chlorin e6. However, cytotoxicity is significantly low and excellent in safety. In an anti-HCV action, the anti-HCV agent of the invention has a different action mechanism from the known anti-HCV agents. Therefore, a more excellent anti-HCV action can be expected by combining with the known anti-HCV agents.
