Provided is a continuous casting mold with which it is possible to prevent a crack on the surface of a cast piece due to a variation in the thickness of a solidified shell caused by transformation from ´ iron to ³ iron in medium-carbon steel which is accompanied by a peritectic reaction. A continuous casting mold having a mold copper plate composed of copper or a copper alloy, the mold having plural separate portions 3 filled with a foreign metal formed by filling circular concave grooves formed on the inner wall surface of the mold copper plate and having a diameter of 2 mm to 20 mm in the inner wall surface of the mold copper plate 1 at least in the region from a meniscus to a position located 20 mm or more lower than the meniscus with the foreign metal whose thermal conductivity is 80% or less of that of the mold copper plate or 125% or more of that of the mold copper plate, in which the ratio of the Vickers hardness HVc of the mold copper plate to the Vickers hardness HVm of the filling metal satisfies relational expression (1) below, and in which the ratio of the thermal expansion coefficient ±c of the mold copper plate and the thermal expansion coefficient ±m of the filling metal satisfies relational expression (2) below. 0.3 ‰¤ HVc / HVm ‰¤ 2.3 0.7 ‰¤ ±c / ±m ‰¤ 3.5