The utility model provides a plane detector holding unit and a plane detector. Through the plane detector holding unit and the plane detector, the arrangement operability can be improved, the arrangement freedom degree can be improved, and space can be saved. According to the implementation mode, the plane detector holding unit is provided with a holding part and a supporting part, wherein the movable plane detector for detecting X rays is held through the holding part the supporting part is used for fixing the plane detector when the end face of the plane detector held by the holding part makes contact with a horizontal plane so that the posture of the plane detector can be maintained, and the plane detector is supported in any of a first supporting state and a second supporting state when the posture of the plane detector is fixed by the supporting part according to the first supporting state, the supporting part moves to the detecting plane side of the plane detector to support the plane detector according to the second supporting state, the supporting part moves to the plane side different from the detecting plane of the plane detector to support the plane detector.
