PURPOSE: To perform finish shaping by swift and appropriate cutting of a foundation of bowl-shaped china and porcelain.

CONSTITUTION: In a foundation 2 of bowl-shaped china and porcelain which is kept sending in order to an index 3 under a turned over state and has finished molding and drying, a difference between a detected value and reference value is obtained by an infrared position sensor 11 detecting a distortion of the central part of the bottom of the foundation 2 of china and porcelain at the index 3. Then cutting tools 8, 10 are moved by a servomotor 7 for cutting the bottom part, which moves a cutting tool 8 in a vertical direction to the bottom part 4 of the foundation 2 of the china and porcelain by an N/C device 13 putting out a control signal obtained by adding a quantity of movement of a difference to the quantity of movement in relation to the established cutting corresponding to a reference value and a servomotor 9 for cutting of the outerperipheral part, moving the cutting tool 10 in a horizontal direction to the outerperipheral part 5 of the foundation 2 of the chain and porcelain.