A light control device comprising: a light control sheet that includes a plurality of light control units (20A-20H) each configured to reversibly change light transmittance, the plurality of light control units being arranged according to a first arrangement that has specific regularity; a detection sheet that includes a plurality of detection units (10A-10H) each configured to detect external input, the plurality of detection units being arranged according to a second arrangement that has the same regularity as the regularity of the first arrangement; a driving unit configured to output a respective change signal for changing the light transmittance to each of the light control units; and a light control processing unit configured to associate each of the detection units with at least one of the light control units, wherein the light control processing unit is configured to cause the driving unit to output the respective change signal to at least one of the light control units associated with one of the detection units if the one of the detection units has detected the external input,; wherein the detection sheet includes a plurality of detection elements each configured to detect a respective change in capacitance; wherein a detection element group (13A-13C) is defined as a set of detection elements and the detection sheet comprises a plurality of adjacent detection element groups; and characterized in that the light control processing unit further includes a storage unit configured to store conversion data for associating each of the detection elements with the detection element group to which the detection element belongs; and the light control processing unit is configured to perform creation processing to create the conversion data and to perform general processing, wherein, in the creation processing, one of the light control units is driven into a visible state, and the conversion data is created so as to associate, to a detection element group, a set of detection elements based on detection elements tapped by a user as corresponding to the light control unit in a visible state; and in the general processing, each of the created detection element groups is associated with a corresponding one of the detection units based on the conversion data, so as to associate each of the detection units with a corresponding light control unit. a light control sheet that includes a plurality of light control units (20A-20H) each configured to reversibly change light transmittance, the plurality of light control units being arranged according to a first arrangement that has specific regularity; a detection sheet that includes a plurality of detection units (10A-10H) each configured to detect external input, the plurality of detection units being arranged according to a second arrangement that has the same regularity as the regularity of the first arrangement; a driving unit configured to output a respective change signal for changing the light transmittance to each of the light control units; and a light control processing unit configured to associate each of the detection units with at least one of the light control units, wherein the light control processing unit is configured to cause the driving unit to output the respective change signal to at least one of the light control units associated with one of the detection units if the one of the detection units has detected the external input,; wherein the detection sheet includes a plurality of detection elements each configured to detect a respective change in capacitance; wherein a detection element group (13A-13C) is defined as a set of detection elements and the detection sheet comprises a plurality of adjacent detection element groups; and characterized in that the light control processing unit further includes a storage unit configured to store conversion data for associating each of the detection elements with the detection element group to which the detection element belongs; and the light control processing unit is configured to perform creation processing to create the conversion data and to perform general processing, wherein, in the creation processing, one of the light control units is driven into a visible state, and the conversion data is created so as to associate, to a detection element group, a set of detection elements based on detection elements tapped by a user as corresponding to the light control unit in a visible state; and in the general processing, each of the created detection element groups is associated with a corresponding one of the detection units based on the conversion data, so as to associate each of the detection units with a corresponding light control unit.