To facilitate work and shorten time therefor, reduce the number of jigs, and set accurate positioning.

A surface gauge 1 for ceramic art for scratching a mark line K of cut in a bottom side circumference Md of an intermediate molding M obtained by molding on a potter's wheel comprises a base part 2 having a platform surface 2u on which the intermediate molding M is placed, a mounting part 3 disposed in a given position on the base part 2, and a marking part 4 which has a vertical rod part 5 with one end having a mountable portion 6 releasably mountable on the mounting part 3, and a lateral rod part 8 with one end having a pointed portion 7 for scratching the mark line K, and in which a repositioning part 9 can fix the lateral rod part 8 laterally in an arbitrary position on the vertical rod part 5.