To provide a fireproof material support can easily perform adjustment to obtain an optional length of fireproof material receiving board for supporting a fireproof material, and to provide the fireproof material receiving board.

The fireproof material support 20 includes: a support body 21; and the plurality of fireproof receiving boards 30 to be supported by the support board of the support body 21 in order to support thermally expansible fireproof materials 11. The fireproof material receiving boards 30 are made of nonflammable paper and formed to be cut with a manual cutter, and supported by the support board so as to be extended from the support board toward respective wiring/piping material groups 101, 102 in the longitudinal direction. The fireproof receiving boards 30 are formed so as to adjust the length of extension from the support board by cutting the extension part from the support board toward the respective wiring/piping material groups 101, 102.