To provide a model tooth position adjuster capable of arranging model teeth of a dentition model in appropriate positions easily and also capable of reducing cost necessary for orthodontic treatment.

The model tooth position adjuster 1 comprises a position adjuster 4 extending along a part of a bow-shaped dentition of a dentition model 2 manufactured on the basis of the dentition of a patient, and a tooth abutting section 7 arranged on the position adjuster 4 which abuts tooth faces 8 of model teeth 5 of the dentition model 2. The tooth abutting section 7 has faces 21-24 complementally to conservation object teeth which have shapes complementally to tooth faces 8 of the conservation object teeth and a face 26 complementally to an adjustment object tooth which has a shape complementally to tooth face 8 of the adjustment object tooth and is arranged leaving a gap 25 between the tooth face 8 of the adjustment object tooth.