The present invention provides an anti-hepatitis C virus composition that includes a substance that suppresses the expression or function of a PA28γ gene, a method for preventing hepatitis C viral infection or suppressing hepatitis C virus growth that includes the step of administering the composition to a subject, and a method for screening an effective component of an anti-hepatitis C virus composition that includes the step of selecting a substance that inhibits the expression or function of a PA28γ gene.
