An object of the invention is to provide a field programmable gate array which is able to prevent an inappropriate value from being output to the outside of an FPGA even when an SRAM-based programmable logic portion is out of order and to secure safety of a system. The field programmable gate array of the invention includes a hard macro CPU in which a circuit structure is fixed, a programmable logic in which a circuit structure is changeable, a diagnosis circuit which diagnoses an abnormality of the programmable logic, and a fail-safe interface circuit which is able to control an external output from the programmable logic to a safe side, and the hard macro CPU outputs a fail-safe signal which is an output of a safe side to the fail-sate interface circuit when an error is detected by the diagnosis circuit.