A video processing device, comprising: a video acquirer configured to acquire a video in which the face of an image capture object irradiated with infrared light is captured; a video recognition unit configured to recognize an iris part and an eyelid part in the video acquired by the video acquirer; and a luminance value acquirer configured to acquire a luminance value of each of the iris part and the eyelid part recognized by the video recognition unit; characterized by a luminance adjuster configured to calculate an adjustment amount based on a predetermined iris luminance upper threshold in the iris part and the luminance of the iris part that have been already acquired by the luminance value acquirer, wherein the luminance adjuster is configured to adjust the luminance values of the iris part and the eyelid part by subtracting the adjustment amount from the luminance values of the iris part and the eyelid part, respectively, if the luminance value of the eyelid part after luminance adjustment is not lower than the predetermined eyelid luminance lower threshold minus a luminance decrease threshold (ΔB1) of an eyelid luminance lower threshold, the adjustment amount is represented by Δ 1 = X 0 − R 1, wherein Δ1 is the adjustment amount, X0 is the luminance value of the iris part that have been already acquired by the luminance value acquirer, and R1 is the predetermined iris luminance upper threshold, and if the luminance value of the eyelid part after luminance adjustment is lower than the predetermined eyelid luminance lower threshold minus the luminance decrease threshold of the eyelid luminance lower threshold, the luminance adjuster is configured to adjust the luminance values of the iris part and the eyelid part by subtracting another adjustment amount instead of the adjustment amount from the luminance values of the iris part and the eyelid part, respectively, the another adjustment amount is represented by Δ 2 = X 0 + Y 0 − R 1 + L 1 / 2, wherein Δ2 is the another adjustment amount, Y0 is the luminance value of the eyelid part that have been already acquired by the luminance value acquirer, and L1 is the eyelid luminance lower threshold. a video acquirer configured to acquire a video in which the face of an image capture object irradiated with infrared light is captured; a video recognition unit configured to recognize an iris part and an eyelid part in the video acquired by the video acquirer; and a luminance value acquirer configured to acquire a luminance value of each of the iris part and the eyelid part recognized by the video recognition unit; a luminance adjuster configured to calculate an adjustment amount based on a predetermined iris luminance upper threshold in the iris part and the luminance of the iris part that have been already acquired by the luminance value acquirer, wherein the luminance adjuster is configured to adjust the luminance values of the iris part and the eyelid part by subtracting the adjustment amount from the luminance values of the iris part and the eyelid part, respectively, if the luminance value of the eyelid part after luminance adjustment is not lower than the predetermined eyelid luminance lower threshold minus a luminance decrease threshold (ΔB1) of an eyelid luminance lower threshold, the adjustment amount is represented by Δ 1 = X 0 − R 1, wherein Δ1 is the adjustment amount, X0 is the luminance value of the iris part that have been already acquired by the luminance value acquirer, and R1 is the predetermined iris luminance upper threshold, and if the luminance value of the eyelid part after luminance adjustment is lower than the predetermined eyelid luminance lower threshold minus the luminance decrease threshold of the eyelid luminance lower threshold, the luminance adjuster is configured to adjust the luminance values of the iris part and the eyelid part by subtracting another adjustment amount instead of the adjustment amount from the luminance values of the iris part and the eyelid part, respectively, the another adjustment amount is represented by Δ 2 = X 0 + Y 0 − R 1 + L 1 / 2, wherein Δ2 is the another adjustment amount, Y0 is the luminance value of the eyelid part that have been already acquired by the luminance value acquirer, and L1 is the eyelid luminance lower threshold. Δ1 is the adjustment amount, X0 is the luminance value of the iris part that have been already acquired by the luminance value acquirer, and R1 is the predetermined iris luminance upper threshold, and if the luminance value of the eyelid part after luminance adjustment is lower than the predetermined eyelid luminance lower threshold minus the luminance decrease threshold of the eyelid luminance lower threshold, the luminance adjuster is configured to adjust the luminance values of the iris part and the eyelid part by subtracting another adjustment amount instead of the adjustment amount from the luminance values of the iris part and the eyelid part, respectively, the another adjustment amount is represented by Δ 2 = X 0 + Y 0 − R 1 + L 1 / 2, wherein Δ2 is the another adjustment amount, Y0 is the luminance value of the eyelid part that have been already acquired by the luminance value acquirer, and L1 is the eyelid luminance lower threshold.