An information acquisition device for an object to be measured, comprising: an imaging device which generates a pickup image of a predetermined image pickup range, wherein the imaging device is an optical camera having an optical axis, said optical camera generating said pickup image from light, wherein said pickup image is in a direction at right angles relative to the direction of the optical axis of the optical camera, and wherein said pickup image is divided into image pickup sections that form a matrix, and each of the image pickup sections corresponds to an image section of the pickup image; a modulated light emitting unit configured to emit modulated light toward the image pickup range wherein received light incident on the optical camera is a combination of incident reflected light of the modulated light that is reflected off the object to be measured in the image pickup range and incident reflected light derived from background light; a distance calculation unit configured to calculate a required time for the modulated light to reach an object to be measured in the image pickup range and to return as reflected light based on the pickup image so as to calculate a distance to the object to be measured in the image pickup range of the optical camera based on the required time; a temperature detection device configured to detect a temperature of each image pickup section and to correct said temperature of each image pickup section based on a corrected value obtained by correcting an absolute incident amount of infrared radiation for each image pickup section based on the distance to the object to be measured detected by the distance calculation unit, thereby preventing the same temperature from being detected as different temperatures due to the different distances of the object to be measured; and an information acquisition unit configured to acquire information on the object to be measured based on the distance to the object to be measured calculated by the distance calculation unit and the temperature of each image pickup section detected by the temperature detection device. an imaging device which generates a pickup image of a predetermined image pickup range, wherein the imaging device is an optical camera having an optical axis, said optical camera generating said pickup image from light, wherein said pickup image is in a direction at right angles relative to the direction of the optical axis of the optical camera, and wherein said pickup image is divided into image pickup sections that form a matrix, and each of the image pickup sections corresponds to an image section of the pickup image; a modulated light emitting unit configured to emit modulated light toward the image pickup range wherein received light incident on the optical camera is a combination of incident reflected light of the modulated light that is reflected off the object to be measured in the image pickup range and incident reflected light derived from background light; a distance calculation unit configured to calculate a required time for the modulated light to reach an object to be measured in the image pickup range and to return as reflected light based on the pickup image so as to calculate a distance to the object to be measured in the image pickup range of the optical camera based on the required time; a temperature detection device configured to detect a temperature of each image pickup section and to correct said temperature of each image pickup section based on a corrected value obtained by correcting an absolute incident amount of infrared radiation for each image pickup section based on the distance to the object to be measured detected by the distance calculation unit, thereby preventing the same temperature from being detected as different temperatures due to the different distances of the object to be measured; and an information acquisition unit configured to acquire information on the object to be measured based on the distance to the object to be measured calculated by the distance calculation unit and the temperature of each image pickup section detected by the temperature detection device.