PURPOSE: To make it possible to simply detach an internal resin, by respectively providing flanges to the lower parts of opposed flat plates so as to be capable of placing a plate thereon and passing a core rod having a protruded part at the leading end thereof through the center of a support body so as to move the same up and down by a handle.

CONSTITUTION: Two flat plates 7, 8 having flanges 9, 10 provided to the lower parts thereof are opposed and a plate 11 capable of fixing a mortar shaped mold 5 for molding a resin 2 having a specimen 1 to be observed embedded therein is provided on the flanges 9, 10. In addition, a core rod 14 is threaded with a support body 15 piercing through the flat plates 7, 8 at the center part thereof while a protruded part 16 is provided to the leading end of the core rod 14 and a handle 13 is operated so as to move said core rod 14 up and down to push out the embedded resin 2 in the mold 5. By this mechanism, because of the mold having a mortar shape, the internal resin 2 can be simply taken out while being pushed out by the rotation of the handle 13.