This paper considered about the burr that occurs with drilling of SMC products. SMC products are produced bycompressing a material sheet using metal molds (heat it to 145℃). In the material sheet, the glass fiber (about 25mm in length) and the unsaturated polyester that contained the filler material and the curing starting material(thermosetting type) were put between the polyester films. However, burr generated when SMC product is drilled inthe production process often becomes a problem. This paper paid attention between the amount of the burrgeneration and the number of piled SMC material sheet. The number of piled SMC sheet is one of the conditions incompression molding. As the result, the relation between the amount of the burr generation and the number of piledSMC material sheet was shown experimentally.