To easily and surely compare the visibility of hard copy images and the images of a luminous type display by providing a window for observation whose opening area is variable on the partition of a sample installation space and an observation space.

A visibility conversion and observation device is divided into the observation space B and the sample installation space A by the partition 3. The color of the partition 3 is an achromatic color and the observation space B is lighted by a lighting fixture 2. The hard copy of a printed matter or the like or sample images by the luminous type display such as a CRT or the like are placed on a sample installation base 6 installed in the sample installation space A and the sample installation space A is lighted by the lighting fixture 4. By adjusting the height of the sample installation base 6 and the area of the window for the observation provided on the partition 3, only the sample images are observed from an observer.