An imaging device comprising: a plurality of light sources (11a, 11b, 11c, 11d) each configured to emit light to a different area of a subject; an imaging circuitry configured to obtain a captured image by capturing the subject; at least one processor configured to: control the plurality of light sources (11a, 11b, 11c, 11d) to sequentially emit light in a predetermined light-emission order, control the imaging circuitry to capture an image of the subject each time a light source (11a, 11b, 11c, 11d) of the plurality of light sources (11a, 11b, 11c, 11d) emits light, obtain, based on a new captured image, an image area of the subject to which the light source (11a, 11b, 11c, 11d) emits light, identify whether motion of a predetermined detection target exists in the obtained image area of the captured image, when the motion of the predetermined detection target does not exist in the obtained image area of the captured image, control the plurality of light sources (11a, 11b, 11c, 11d) to continue to emit light in the predetermined light emission order, and when the motion of the predetermined detection target exists in the obtained image area of the captured image, control the plurality of light sources (11a, 11b, 11c, 11d) so that a light emission frequency of the light source (11a, 11b, 11c, 11 d) corresponding to the image area identified to include the motion of the detection target from among the plurality of light sources (11a, 11b, 11c, 11d) is increased. a plurality of light sources (11a, 11b, 11c, 11d) each configured to emit light to a different area of a subject; an imaging circuitry configured to obtain a captured image by capturing the subject; at least one processor configured to: control the plurality of light sources (11a, 11b, 11c, 11d) to sequentially emit light in a predetermined light-emission order, control the imaging circuitry to capture an image of the subject each time a light source (11a, 11b, 11c, 11d) of the plurality of light sources (11a, 11b, 11c, 11d) emits light, obtain, based on a new captured image, an image area of the subject to which the light source (11a, 11b, 11c, 11d) emits light, identify whether motion of a predetermined detection target exists in the obtained image area of the captured image, control the plurality of light sources (11a, 11b, 11c, 11d) to sequentially emit light in a predetermined light-emission order, control the imaging circuitry to capture an image of the subject each time a light source (11a, 11b, 11c, 11d) of the plurality of light sources (11a, 11b, 11c, 11d) emits light, obtain, based on a new captured image, an image area of the subject to which the light source (11a, 11b, 11c, 11d) emits light, identify whether motion of a predetermined detection target exists in the obtained image area of the captured image, when the motion of the predetermined detection target does not exist in the obtained image area of the captured image, control the plurality of light sources (11a, 11b, 11c, 11d) to continue to emit light in the predetermined light emission order, and when the motion of the predetermined detection target exists in the obtained image area of the captured image, control the plurality of light sources (11a, 11b, 11c, 11d) so that a light emission frequency of the light source (11a, 11b, 11c, 11 d) corresponding to the image area identified to include the motion of the detection target from among the plurality of light sources (11a, 11b, 11c, 11d) is increased.