[Problem] The present invention particularly provides a flame retardant paper that is less likely to be torn during manufacturing processes and that has low corrosiveness to metal of the equipment for production, in addition to high flame retardancy which is suitable for a member of a radio wave absorber.[Solution] The flame retardant paper of the present invention is a flame retardant paper containing pulp, aluminum hydroxide, guanidine phosphate and guanidine sulfamate, wherein the content of the pulp is 10 to 35% by mass, the content of the aluminum hydroxide is 40 to 70% by mass, and the total content of the guanidine phosphate and the guanidine sulfamate is 0.1 to 10% by mass, given that each of the contents is with respect to the entirety of the flame retardant paper.
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