A grille shutter apparatus includes a shutter mechanism arranged in an grille opening portion positioned at a front portion of a vehicle body of a vehicle to control a flow rate of air flowing from the grille opening portion to an internal portion of the vehicle body, and a frame supporting the shutter mechanism in the grille opening portion, the frame including a fixing portion at one end to be fixed in the grille opening portion, the frame including a protruding portion making contact with a front grille and generating a rotational moment at the frame in a case where the front grille arranged at an opening end of the grille opening portion moves rearward due to an occurrence of a collision of the vehicle, the rotational moment acting about the fixing portion.