To provide a ROM inspection system capable of detecting a defect in each individual ROM and facilitating management of sum values.

In the ROM inspection system wherein a CPU 3 placed on a printed circuit board 4 together with two or more ROMs 1, 2 storing at least program data or the like therein is connected with an external determination device 5 through a communication means 6, the CPU 3 calculates an individual sum value of each of the two or more ROMs 1, 2 and outputs the result of bit connecting the two or more sum values to the determination device 5 through the communication means 6 while the determination device 5 performs inspection of the ROMs 1, 2 by comparing the sum values stored in advance with the sum values transmitted from the CPU 3.