Disclosed is a pharmaceutical composition for preventing or treating a fatty liver disease containing, as an active ingredient, a pyrazole-based compound or a pharmaceutically acceptable salt thereof. 3-phenyl-4-alkyl-1-(pyridin-2-yl)-1H-pyrazol-5-ol or a pharmaceutically acceptable salt thereof is capable of effectively inhibiting fatty liver, hepatic inflammation and hepatic fibrosis, and is useful for preventing or treating NAFLD, in particular, NASH.