Light control sheet and light control device

A light control device, comprising:

• a light control sheet that changes a linear transmittance depending on a drive voltage;
• and
• a driving unit comprising circuitry configured to control a drive voltage applied to the light control sheet,
• wherein the light control sheet includes a light control layer comprising a resin layer and orientation particles, a pair of transparent electrode layers sandwiching the light control layer, and a pair of transparent support layers sandwiching the light control layer and the pair of transparent electrode layers, the light control layer has thicknesses measured in a plurality of measurement positions such that the thicknesses are within a range of 0.8 times to 1.2 times a median value of the thicknesses and has a structure such that the resin layer has a plurality of voids and that the orientation particles are contained in the voids dispersed in the resin layer, a variance in a middle value, {(Vmax−Vmin)/Vavr}×100, is 35.0% or less, where Vmin is a minimum value, Vmax is a maximum value, Vavr is an average value of middle values obtained from characteristic curves in the plurality of measurement positions, each of the characteristic curves is obtained by measuring a change of a linear transmittance of visible light when a drive voltage applied to the transparent electrode layers is changed, each of the middle values is a middle a value Vm between a first voltage Va and a second voltage Vb, the first voltage Va is a lower limit drive voltage of a range in which an absolute value of a change ratio in the linear transmittance is 0.5%/V or more, the second voltage Vb is an upper limit drive voltage, and the circuitry of the driving unit is configured to switch among a first mode of not applying the drive voltage, a second mode of applying a voltage of equal to or more than the second voltage Vb, and a third mode of applying a voltage between the first voltage Va and the second voltage Vb such that a linear transmittance of the light control sheet becomes a linear transmittance between a linear transmittance in the first mode and a linear transmittance in the second mode.