The music genre judging device comprises: a signal processing unit 10 for outputting integration value and differential value for each of low-frequency component and high-frequency component of music reproduction signal inputted from a music reproduction device 100 to a line input terminal 4; a data generation unit 30 for inputting the integration value and the differential value outputted from the signal processing value by each predetermined sampling unit time, judging whether or not each of the integration value and the differential value exceeds a predetermined level within the sapling unit time, and generating analysis data obtained by totalizing for each sampling cycle, the number of times of judgments that the value exceeding the predetermined level is detected; and a data analysis unit 31 for judging a genre of music outputted from the music reproduction n device 100 based on the totalized value of the analysis data.