PURPOSE: To slantingly support an unfired or fired product, which can be loaded onto and unloaded from a truck body in firing, so as to support the unfired or fired product in a stabilized state and inhibit warping or cambering of the product.

CONSTITUTION: Mount plates 8, 8a... for unfired or fired products are provided slantingly on the upper surface of a board-shaped rack body so that by holding unfired products in a slanted state by means thereof unfired products can be loaded in an increased number. Unfired or fired products, held by the mount plates 8, 8a..., are supported in a stabilized state and kept from being dislocated at all even by vibrations, etc., during their movement. Moreover, the weight of parts of an unfired product, specifically at its lateral parts jutting out from the mount plates 8, 8a..., acts on the jutting-out parts in such a way as not to allow the front or back side to deform with contraction during firing.