An image adjustment system includes a camera, an image adjustment device, an image display device, and a controller. The image display device displays a captured image adjusted by the image adjustment device. The image adjustment device includes an image generator and an image processor. The image generator generates a spherical surface image. The image processor acquires the spherical surface image from the image generator to display the spherical surface image on the image display device on the basis of instruction information output from the controller. The image processor rotates the spherical surface image on the basis of the instruction information. The image processor adjusts a right-eye image or a left-eye image of the captured image displayed on the image display device in accordance with a rotation of the spherical surface image.