Provided are a twin-roll strip caster, a method for manufacturing a duplex stainless steel sheet using the same, and a thin duplex stainless steel sheet. The twin-roll strip caster includes a pair of casting rolls rotating in opposite directions, an edge dam installed such that a molten steel pool is formed on respective sides of the casting rolls, and a meniscus shield provided to cover the molten steel pool such that a contact between the molten steel pool and air is blocked, wherein hills and valleys are alternately arranged on surfaces of the cast rolls in circumferential directions thereof and a hill area in edge sections thereof is higher than that in centers sections thereof. Since cast rolls in which a hill area ratio of edge sections is higher than that of center sections are used, a thin stainless steel sheet with improved edge quality may be provided.
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