[Problem] To provide an inexpensive and easily popularized technique for creating data for a virtual articulator on a computer, the technique not requiring an articulator to be created. [Solution] A diagnostic device is provided with a position data generating unit (224) and a combining unit (226). The position data generating unit (224) generates first position data and second position data using an orientation image of the orientation of a connecting member for connecting an upper bow and a bite fork, an upper image indicating the positional relationship of the bite fork and the maxillary teeth of a patient, and an occlusion image indicating the positional relationship of the maxillary teeth and the mandibular teeth of the patient. The combining unit (226) aligns a three-dimensional model of the maxillary teeth and mandibular teeth of the patient generated by a model generating unit (223) using the first position data and the second position data, and generates a virtual articulator.
