To reduce burden of fatigue or the like without any feeling of physical disorder for an operator usually optical fibers in sight, by normally horizontally setting a television monitor so as to observe axis shift of the optical fibers at high precision.

In an image processor for optical fiber observation in which the signal of an image from a telecamera 1 can be outputted to a television monitor 2, the image from the telecamera 1 is image-processed, and desired information with regard to optical fibers 4a, 4b pictured on the image can be outputted, a scanning conversion part 5 in which the image from the telecamera 1 is rotated up to 90 degrees and can be outputted to the television monitor 2 is provided.