The present invention without moving the imaging platform, without having to rent a hand of the caregiver, also during the shooting to the patient, without causing pain to press the cassette at the back, the cassette the optimum desired position while sitting on a chair the held to provide a chair cassette holder can perform X-ray imaging. A cassette between the spine and the back of a patient sitting on a chair can be placed at any height in the cassette holder 1 for use in performing X-ray imaging, the cassette receiving three mounting a cassette K and the height position of the cassette holding the cassette in a substrate 2 to be adjusted, the cassette receiving has a engaging piece 32 which is fixed to height adjustment holes are arranged a plurality of the substrates.BACKGROUND 5.【課題】撮影台に移動することなく、介助者の手を借りることなく、また、患者に撮影の間、カセッテを背中で押し付ける苦痛を与えることなく、椅子に座ったまま最適所望位置にカセッテを保持しX線撮影を行うことができる椅子用カセッテ保持具を提供する。【解決手段】椅子に座した患者の背と背もたれの間にカセッテを任意の高さに配置してX線撮影を行う際に使用するカセッテ保持具1において、カセッテKを載置するカセッテ受け3とカセッテの高さ位置を調整する基板2でカセッテを保持し、カセッテ受けは基板に複数配設された高さ調整穴に篏挿固定される係合片32を有する。【選択図】図5