An image processing method and an image processing device which can improve sharpness by producing a binocular rivalry intentionally are provided. An image processing device 100 includes a right eye image acquiring unit 101 which generates a right eye image by performing a correction processing on an input image, a left eye image acquiring unit 102 which generates a left eye image which produces a binocular rivalry with the right eye image by performing a correction processing which is different from the correction processing, and a multi-eye display unit which displays the right eye image and the left eye images to different viewpoints.