A light control unit includes: a first light-shielding fin and a second light-shielding fin arranged to have a center axis of light passing therethrough interposed therebetween, and a moving device configured to move the first light-shielding fin and the second light-shielding fin so that respective end portions of the first light-shielding fin and the second light-shielding fin move in directions toward and away from each other, and the first light-shielding fin and the second light-shielding fin include: an arm moved by the moving device, and a light-shielding portion provided on the arm and configured to move with the arm to be arranged in a passage area of the light, and at least one of the first light-shielding fin and the second light-shielding fin includes an adjusting portion configured to adjust a mounting position between the arm and the light-shielding portion, the arm and the light-shielding portion being separate members.