A dental tray system includes a maxillary impression tray configured to be filled with an impression material and to take an impression of an upper jaw side of an oral cavity； a mandibular impression tray configured to be filled with the impression material and to take the impression of a lower jaw side of the oral cavity； and a support plate provided between the maxillary impression tray and the mandibular impression tray and configured to movably support the maxillary impression tray and the mandibular impression tray in a front-to-rear direction.
