ARITHMETIC OPERATION DEVICE FOR AUTOMOBILES

An arithmetic operation device for automobiles includes an arithmetic element state detection unit that detects a parameter indicating a state of an arithmetic element (110), an external device detection unit that detects a use state of a device that affects the parameter, and a mode selection unit (116) that selects one of a normal mode in which both a basic traveling function unit (114) that can execute control related to a basic traveling function and an automatic driving function unit (115) that can execute control related to an automatic driving function and a degeneration mode in which only the basic traveling function unit (114) is operated, and the mode selection unit (116) selects the degeneration mode when the parameter exceeds a threshold or when it is predicted that the parameter exceeds the threshold.