Substrate supporting rod and substrate cassette using the same

A cassette configured for supporting a substrate, comprising:

• at least two pairs of supporting rods, each rod comprising:
• a resin body which comprises a cylindrical body portion having an axial first through hole and a number of shelves, the number of shelves arising from said body portion and extending in parallel to one another at a predetermined pitch, said body portion and the number of shelves being unitary portions of the resin body;
• and
• a metal rod being received in said first through hole of the body portion;
• wherein each of the shelves is provided with a projection extending at a free end thereof, said projection is cylindrical in shape of which the diameter is larger than the thickness of the shelf, and a central axis of said projection is substantially perpendicular to a central axis of the body portion;
• and
• a pair of frames cooperating with the supporting rods in the overall shape of a box for accommodating a substrate between the shelves of each opposed pair of supporting rods.