The present invention pertains to: an ammonia removal material used to obtain a mixed gas (B) having an ammonia concentration of 0.1 mol ppm or lower from a mixed gas (A) containing hydrogen, nitrogen, and ammonia and having an ammonia concentration exceeding 0.1 mol ppm, wherein the ammonia removal material contains zeolite having a pore size of 0.5-2.0 nm; a method for removing ammonia from the mixed gas in which the ammonia removal material is used; and a method for manufacturing hydrogen gas for a fuel cell automobile having the ammonia removal method.