PURPOSE: To provide a non-calcined magnesia.dolomite.carbon brick improved in oxidation resistance of the brick without paying attention to the selection of the production processes and the substances to be added.

CONSTITUTION: A non-calcined magnesia.dolomite.carbon brick comprises 20-75wt.% of at least one of a dolomite raw material containing ≥25wt.% of a CaO component and a magnesia.calcia raw material having ≥25wt.% of the CaO component, 5-40wt.% of a carbonaceous raw material, and the balance of a magnesia raw material as refractory raw materials. A magnesium- boron composite material is added in an amount of 0.1-1.0wt.% based on the refractory raw materials.