PROBLEM TO BE SOLVED: To obtain a radio frequency signal identification device which is capable of executing identification of a radio frequency signal even in a region where a signal amplitude is substantially constant, and is capable of suppressing degradation in accuracy of identification due to superposition of noise.SOLUTION: The radio frequency signal identification device includes a signal feature output unit which extracts, on the basis of a radio frequency signal, its radio frequency signal feature pattern, a recording storage unit which records collation signal feature patterns, and a collation unit which collates the radio frequency signal feature pattern with the collation signal feature patterns to identify the radio frequency signal. The signal feature output unit includes a periodical difference feature extraction unit which extracts a feature quantity of a periodic solution part where modulation of the radio frequency signal is repeated.
