A medical X-ray photography apparatus includes the turning arm and a moving mechanism. The turning arm supports an X-ray generator and an X-ray detector. The moving mechanism includes a turning part that turns the turning arm and a moving part that moves the turning arm along a two-dimensional plane orthogonal to an axial direction of a turning shaft. The medical X-ray photography apparatus also includes a photographic region assignment receiving part that receives an operation to assign a part of a dental arch as a pseudo intraoral radiography region, a main-body control part that controls the moving mechanism based on a movement starting signal to move the turning arm to a predetermined photography starting position corresponding to the pseudo intraoral radiography region, and a signal output switch that includes a movement starting signal output part outputting the movement starting signal to the main body control part.
