MARTENSITIC STAINLESS STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE AND METHOD FOR MANUFACTURING SAME, AND MARTENSITIC STAINLESS BLADED PRODUCT

A martensitic stainless steel sheet has a steel composition including: by mass%, 0.30 to 0.60% of C; 0.05 to 1.00% of Si; 0.10 to 1.50% of Mn; 11.0 to 15.0% of Cr; 0.01 to 0.60% or less of Ni; 0.01 to 0.50% of Cu; 0.01 to 1.0% of Mo; 0.01 to 0.50% of V; 0.03% or less of Al; 0.01 to 0.05% of N; 0.01 % or less of O. The martensitic stainless steel sheet satisfies that: carbides observed in an area of a plate thickness of 1/2t ± 0.7 mm on a test surface parallel to a rolling direction and a plate thickness direction of the steel sheet has 3.0 or less of a carbide cleanliness index, the carbides being defined as inclusions corresponding to inclusions of Type B specified in JIS G0555; that a carbide area ratio is 2% or less through observation using a 200-fold optical microscope; or that a content of coarse carbides collected with a filter having 10-µm mesh in an extraction residue analysis with respect to an entire thickness of the steel sheet is 0.6 mass% or less in terms of a Cr content.