A gas pressure controlled casting mold is disclosed having a hot-top introducing a molten metal of aluminum or aluminum alloy, and a mold body which passes the molten metal of aluminum or aluminum alloy introduced from the hot-top through a molten metal passage portion for cooling and solidification and semi-continuously or continuously casting a billet of aluminum or aluminum alloy. A wall surface of the molten metal passage portion of the mold body is provided with a plurality of lubricating oil blow-out holes for blowing out a lubricating oil. A lubricating oil supply passage is communicatively connected to each lubricating oil blow-out hole and is independently formed at least in a range of a heat affected portion in the mold body. This allows the mold body to be reliably cooled regardless of the difference in the temperature and casting speed conditions and thus can achieve favorable continuous casting.