A medical X-ray photographing apparatus (20,20A,20B) comprising: a support (30,30A,30B) configured to turn an X-ray generator and an X-ray detector about a predetermined turning axis while holding said X-ray generator and said X-ray detector in a facing state, said X-ray generator being configured to emit an X-ray, said X-ray detector being configured to output an electric signal according to an incident X-ray; a support holder configured to rotatably hold said support (30,30A,30B) on a side opposite to a position where said X-ray generator and said X-ray detector are provided; and a turning driver configured to drive and turn said support (30,30A,30B) held by said support holder, characterized in that said medical X-ray photographing apparatus (20,20A,20B) further comprises: a center-direction setting part configured to set a center direction passing through a center of a swing angle of said support (30,30A,30B) in X-ray photography in which the X-ray is emitted from said X-ray generator toward said X-ray detector; a turning controller configured to control said turning driver such that said support (30,30A,30B) turns with a necessary swing angle around said center direction set by said center-direction setting part; and an image processor configured to generate a tomosynthesis image by processing a plurality of projection images based on said electric signal output from said X-ray detector. a support (30,30A,30B) configured to turn an X-ray generator and an X-ray detector about a predetermined turning axis while holding said X-ray generator and said X-ray detector in a facing state, said X-ray generator being configured to emit an X-ray, said X-ray detector being configured to output an electric signal according to an incident X-ray; a support holder configured to rotatably hold said support (30,30A,30B) on a side opposite to a position where said X-ray generator and said X-ray detector are provided; and a turning driver configured to drive and turn said support (30,30A,30B) held by said support holder, characterized in that said medical X-ray photographing apparatus (20,20A,20B) further comprises: a center-direction setting part configured to set a center direction passing through a center of a swing angle of said support (30,30A,30B) in X-ray photography in which the X-ray is emitted from said X-ray generator toward said X-ray detector; a turning controller configured to control said turning driver such that said support (30,30A,30B) turns with a necessary swing angle around said center direction set by said center-direction setting part; and an image processor configured to generate a tomosynthesis image by processing a plurality of projection images based on said electric signal output from said X-ray detector. a center-direction setting part configured to set a center direction passing through a center of a swing angle of said support (30,30A,30B) in X-ray photography in which the X-ray is emitted from said X-ray generator toward said X-ray detector; a turning controller configured to control said turning driver such that said support (30,30A,30B) turns with a necessary swing angle around said center direction set by said center-direction setting part; and an image processor configured to generate a tomosynthesis image by processing a plurality of projection images based on said electric signal output from said X-ray detector.