The present invention provides a prophylactic and therapeutic agent for cataracts different from the prior mechanism of action, and a use for the manufacture of such PPAR activators. The present invention uses a cataract preventing agent and/or a therapeutic agent containing a PPAR activating agent as an active ingredient.本發明提供一種與先前之作用機理不同之白內障之預防劑及治療劑、以及用於製造該等之PPAR活性化劑之用途。本發明使用含有PPAR活性化劑作為有效成分之白內障之預防劑及/或治療劑。