An image capturing device comprising: an image capturing unit configured to capture a plurality of images of a subject and output the plurality of images; an evaluation value acquiring unit configured to acquire a pixel difference value between pixels contained within an auto-shutter area for one captured image of the plurality of captured images outputted by the image capturing unit, wherein the pixel difference value is used as a reference value, and to calculate a difference between the reference value and the pixel difference value for each of the other captured images so as to acquire an evaluation value consecutively as an amount of change; a monitoring unit configured to monitor the amount of change of the captured image consecutively outputted by the image capturing unit; a threshold value setting unit configured to set a threshold value according to the amount of change of the captured image monitored by the monitoring unit; a determining unit cinfigured to determine whether or not the amount of change of the captured image monitored by the monitoring unit exceeds the threshold value set by the threshold value setting unit; a recording control unit configured to record the captured image to a recording unit when the determining unit determines that the amount of change exceeds the threshold value; and a control unit configured to set the threshold value according to a maximum evaluation value, which is the largest evaluation value among the plurality of evaluation values acquired by the evaluation value acquiring unit, wherein the threshold value is set to a greater value as the maximum evaluation value is greater and the threshold value is set to a lesser value as the maximum evaluation value is lesser. an image capturing unit configured to capture a plurality of images of a subject and output the plurality of images; an evaluation value acquiring unit configured to acquire a pixel difference value between pixels contained within an auto-shutter area for one captured image of the plurality of captured images outputted by the image capturing unit, wherein the pixel difference value is used as a reference value, and to calculate a difference between the reference value and the pixel difference value for each of the other captured images so as to acquire an evaluation value consecutively as an amount of change; a monitoring unit configured to monitor the amount of change of the captured image consecutively outputted by the image capturing unit; a threshold value setting unit configured to set a threshold value according to the amount of change of the captured image monitored by the monitoring unit; a determining unit cinfigured to determine whether or not the amount of change of the captured image monitored by the monitoring unit exceeds the threshold value set by the threshold value setting unit; a recording control unit configured to record the captured image to a recording unit when the determining unit determines that the amount of change exceeds the threshold value; and a control unit configured to set the threshold value according to a maximum evaluation value, which is the largest evaluation value among the plurality of evaluation values acquired by the evaluation value acquiring unit, wherein the threshold value is set to a greater value as the maximum evaluation value is greater and the threshold value is set to a lesser value as the maximum evaluation value is lesser.