1. An X-ray photography apparatus comprising: a photographing system comprising a normal X-ray source for irradiating X rays to a subject, a small focus X-ray source for irradiating X rays to said subject, and an X-ray detector for obtaining an image signal by detecting X rays transmitted through said subject; and movement control means for moving and controlling at least one component from among said normal X-ray source, said small focus X-ray source, and said X-ray detector so that the arrangement of said photographing system is switched between a first arrangement suitable for normal photography in which said subject is photographed employing said normal X-ray source, and a second arrangement suitable for magnified photography in which said subject is magnified and photographed, employing said small focus X-ray source.