An automatic exposure control device comprising: an image acquisition section configured to acquire an image that is an image of an object and has been captured by an imaging optical system (231, 232) that receives reflected light, the reflected light being light that has been applied to the object, and reflected by the object; an angle-of-view information acquisition section configured to acquire angle-of-view information that indicates an angle of view of the imaging optical system (231, 232) when the image has been captured, based on identification information that specifies an endoscope system that includes the imaging optical system (231, 232); and an automatic exposure control section comprising: an automatic exposure area setting section configured to set an automatic exposure area within the image to a size corresponding to the acquired angle-of-view information; an exposure control section configured to calculate an automatic exposure evaluation value for evaluating an exposure state within the image based on a luminance value and an automatic exposure weight (W L) of each pixel within the automatic exposure area, and perform an automatic exposure control process based on the calculated automatic exposure evaluation value; and an automatic exposure weight setting section configured to set a weight applied to each pixel within an automatic exposure area as the automatic exposure weight, the automatic exposure area being the area for which the automatic exposure evaluation value is calculated. an image acquisition section configured to acquire an image that is an image of an object and has been captured by an imaging optical system (231, 232) that receives reflected light, the reflected light being light that has been applied to the object, and reflected by the object; an angle-of-view information acquisition section configured to acquire angle-of-view information that indicates an angle of view of the imaging optical system (231, 232) when the image has been captured, based on identification information that specifies an endoscope system that includes the imaging optical system (231, 232); and an automatic exposure control section comprising: an automatic exposure area setting section configured to set an automatic exposure area within the image to a size corresponding to the acquired angle-of-view information; an exposure control section configured to calculate an automatic exposure evaluation value for evaluating an exposure state within the image based on a luminance value and an automatic exposure weight (W L) of each pixel within the automatic exposure area, and perform an automatic exposure control process based on the calculated automatic exposure evaluation value; and an automatic exposure weight setting section configured to set a weight applied to each pixel within an automatic exposure area as the automatic exposure weight, the automatic exposure area being the area for which the automatic exposure evaluation value is calculated. an automatic exposure area setting section configured to set an automatic exposure area within the image to a size corresponding to the acquired angle-of-view information; an exposure control section configured to calculate an automatic exposure evaluation value for evaluating an exposure state within the image based on a luminance value and an automatic exposure weight (W L) of each pixel within the automatic exposure area, and perform an automatic exposure control process based on the calculated automatic exposure evaluation value; and an automatic exposure weight setting section configured to set a weight applied to each pixel within an automatic exposure area as the automatic exposure weight, the automatic exposure area being the area for which the automatic exposure evaluation value is calculated.