An X-ray diagnostic apparatus according to an embodiment is provided with an image-capturing unit, a bed, a moving mechanism, a turning mechanism, and an operation control unit. The image-capturing unit holds an X-ray tube and an X-ray detector so as to face each other. The X-ray tube irradiates a subject under diagnosis with X-rays, and the X-ray detector detects X-rays penetrating the subject under diagnosis. The bed is provided with a top plate on which the subject under diagnosis is placed. The moving mechanism moves the bed in the vertical direction and/or the longitudinal direction. The turning mechanism turns the bed and the image-capturing section around an axis lying parallel to the short-side direction of the top plate in a state in which the positional relationship between the bed and the image-capturing unit is held. The operation control unit controls the moving mechanism in association with the turning mechanism so as to maintain the height of the bottom point of the bed.
