To provide an olefin-based decorative sheet and decorative plate having noncombustibility which cause no deterioration in design by film-thinning without using a halogen-based flame retardant and do not reduce mechanical properties or productivity even if the addition amount of an inorganic material is increased.SOLUTION: There is provided a decorative sheet 10 which has at least an inorganic substance-containing resin layer 1, a pattern layer 2, a polyolefin-based transparent resin layer 3 and a surface protective layer 4, wherein the inorganic substance-containing resin layer 1 has a thickness within the range of 30 to 110 μm, is a mixture obtained by blending 60 to 85 mass% of an inorganic substance, 1 to 39 mass% of a hydrocarbon-based resin and 0.01 to 1 mass% of a dispersant and is stretched by 1.1 to 5.0 times in the film forming direction. Further, there is provided a decorative sheet in which the inorganic substance-containing resin layer 1 is stretched by 1.1 to 1.5 times in the direction vertical to the film forming direction. There is provided a method in which the inorganic substance contains calcium carbonate as a main raw material and contains one more selected from a pigment, titanium dioxide talc, mica, talc and silica as an auxiliary raw material.SELECTED DRAWING: Figure 1
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