Provided is a dental CAD / CAM device capable of accurately producing a dental coating. An intraoral site measurement means (100) for measuring three-dimensional shape data of the intraoral site (130) with an OCT probe (150) that acquires a tomographic image of an observation object using near infrared light, and intraoral site measurement The treatment target tooth three-dimensional shape data acquisition means (200) for obtaining the three-dimensional shape data of the treatment target tooth from the three-dimensional shape data obtained from the means (100), and the treatment target tooth three-dimensional shape data means (200) The covering 3D shape data creating means (300) for creating the covering 3D shape data is provided so as to correspond to the 3D shape data of the treatment target tooth obtained in the above.歯科用被覆物を精度良く作製することができる歯科用ＣＡＤ／ＣＡＭ装置を提供する。近赤外光を用いて観察対象の断層像を取得するＯＣＴプローブ（１５０）で、口腔内部位（１３０）の三次元形状データを測定する口腔内部位測定手段（１００）と、口腔内部位測定手段（１００）から得られた三次元形状データから、治療対象歯の三次元形状データを取得する治療対象歯三次元形状データ取得手段（２００）と、治療対象歯三次元形状データ手段（２００）で得られた治療対象歯の三次元形状データに対応するように、被覆物三次元形状データを作成する被覆物三次元形状データ作成手段（３００）とを有する。
