A phototherapeutic device, comprising: a sheet member (200, 210) attachable to a skin; a plurality of skin-condition sensors (220, 220 1 -220 M) disposed at different positions of the sheet member and each being configured to detect information related to a condition of a portion of the skin; and a plurality of light-emitting device units (500, 230 1 -230 N) disposed at positions on the sheet member corresponding to the positions of the respective skin-condition sensors, and the light-emitting device units being configured to operate on the basis of the information detected by the corresponding skin-condition sensors, wherein each of the light-emitting device units includes a plurality of light-emitting devices (230 1 -230 N) that are configured to emit light having different wavelengths, the sheet member (200, 210) includes a plurality of sections, at least one of the skin-condition sensors and at least one of the light-emitting device units are disposed in each of the sections, the phototherapeutic device further includes an operation determining unit configured to determine an operation of the at least one light-emitting device unit disposed in one section on the basis of the information detected by the at least one skin-condition sensor disposed in said one section, each of the light-emitting device units (230 1 -230 N) is configured to reduce or stop light emission when the degree to which the information detected by the corresponding skin-condition sensor changes exceeds a predetermined threshold after a start of the light emission, the sheet member (200, 210) includes a first region corresponding to one eyelid portion of a face and a second region different from the first region, one of the plurality of light-emitting device units is disposed in the first region and another of the plurality of light-emitting device units is disposed in the second region, the one of the plurality of light-emitting device units is configured to emit light having an intensity lower than an intensity of light emitted by the another of the plurality of light-emitting device units, and the predetermined threshold for the one of the plurality of light-emitting device units is lower than the predetermined threshold for the another of the plurality of light-emitting device units. a sheet member (200, 210) attachable to a skin; a plurality of skin-condition sensors (220, 220 1 -220 M) disposed at different positions of the sheet member and each being configured to detect information related to a condition of a portion of the skin; and a plurality of light-emitting device units (500, 230 1 -230 N) disposed at positions on the sheet member corresponding to the positions of the respective skin-condition sensors, and the light-emitting device units being configured to operate on the basis of the information detected by the corresponding skin-condition sensors, wherein each of the light-emitting device units includes a plurality of light-emitting devices (230 1 -230 N) that are configured to emit light having different wavelengths, the sheet member (200, 210) includes a plurality of sections, at least one of the skin-condition sensors and at least one of the light-emitting device units are disposed in each of the sections, the phototherapeutic device further includes an operation determining unit configured to determine an operation of the at least one light-emitting device unit disposed in one section on the basis of the information detected by the at least one skin-condition sensor disposed in said one section, each of the light-emitting device units (230 1 -230 N) is configured to reduce or stop light emission when the degree to which the information detected by the corresponding skin-condition sensor changes exceeds a predetermined threshold after a start of the light emission, the sheet member (200, 210) includes a first region corresponding to one eyelid portion of a face and a second region different from the first region, one of the plurality of light-emitting device units is disposed in the first region and another of the plurality of light-emitting device units is disposed in the second region, the one of the plurality of light-emitting device units is configured to emit light having an intensity lower than an intensity of light emitted by the another of the plurality of light-emitting device units, and the predetermined threshold for the one of the plurality of light-emitting device units is lower than the predetermined threshold for the another of the plurality of light-emitting device units.