Activation inhibitor for toll-like receptor 7 or toll-like receptor 9

In the present invention, a compound selected from cyclobakuchiol A, cyclobakuchiol B and derivatives thereof, a pharmacologically acceptable salt thereof or a prodrug thereof, is a low molecular weight compound having an action of selectively inhibiting Toll-like receptor 7, or Toll-like receptor 9, and is useful as an active ingredient in an agent for preventing or treating a disease accompanying activation of Toll-like receptor 7, or Toll-like receptor 9.