A light control device includes: a light control element including a first layer stack and a second layer stack which include electrodes provided on base members, respectively, and a liquid crystal layer sandwiched between the first and second layer stacks; a switching element connected between an AC power supply and the light control element; a comparator that detects whether or not the AC power supply is higher than a first voltage that is higher than 0 V and is lower than a maximum value of the AC power supply; and a control circuit that performs PWM control or PFM control on the switching element if the AC power supply is higher than the first voltage.