To provide a dental X-ray radiographing apparatus which can be installed in a space-saving manner in an X-ray room.SOLUTION: The dental X-ray radiographing apparatus comprises: a revolving arm 10 comprising an X-ray generation device 2 and an X-ray detection device 3 which can be arranged opposite to each other； an arm support part 20 supporting the revolving arm 10 in a freely revolvable manner； a support part 30 supporting the arm support part 20 in an ascendable/descendible manner； a jaw positioning part 50 which is supported by the support part 30 in an ascendable/descendible manner and supports a jaw part of a subject. The jaw positioning part 50 is arranged in a prescribed position between the X-ray generation device 2 and the X-ray detection device 3 arranged opposite to each other, and can be retreated from the prescribed position.SELECTED DRAWING: Figure 7【課題】Ｘ線撮影室において省スペースでの設置が可能な歯科用Ｘ線撮影装置を提供する。【解決手段】対向配置が可能なＸ線発生部２とＸ線検出部３とを備える旋回アーム１０と、旋回アーム１０を旋回可能に支持するアーム支持部２０と、アーム支持部２０を昇降可能に支持する支柱部３０と、支柱部３０に昇降可能に支持され、被験者の顎部を支持する顎位置決め部５０と、を備え、顎位置決め部５０は、対向配置されたＸ線発生部２及びＸ線検出部３の間の所定位置に配置されるとともに、所定位置から退避可能に構成されている。【選択図】図７
