PROBLEM TO BE SOLVED: To provide a dental prosthesis creating apparatus which omits a process where a cradle is formed by pouring plaster into a molding flask, and moreover, does not produce occurrence of back-lash in a rotation direction around the central axial line of a dowel pin.SOLUTION: On the underside of a mounting plate 10, a plurality of couples consisting of a pair of elastic pawls 12 is created. This plurality of the couples of the elastic pawls 12 is inserted inside long holes 22 in a cradle 20 side. The elastic pawl 12s engaging projections 13 which are on the outer side parts in the opposite sides of each other are engaged with engaged parts 25 of the long holes 22 on the cradle 20, so that the mounting plate 10 is mounted to the predetermined position of the cradle 20 as positioned.COPYRIGHT: (C)2015,JPO&INPIT