<p>The present invention relates to a mold plate used for metal casting, a mold plate assembly in which such a mold plate is assembled, and a casting mold which is configured with such a mold plate assembly. According to one aspect of the present invention, provided is a mold plate, comprising: a first cooling slot formed along the center section of one surface of the mold plate and extended in parallel to a casting direction to allow an introduced cooling medium to flow in parallel to the casting direction; and at least one second cooling slot branched at a predetermined angle from the first cooling slot and then extended to allow the cooling medium branched from the first cooling slot to flow along both end sections which are in a direction perpendicular to the casting direction in said one surface.</p>
