The invention provides a control device for mutually monitoring two microcomputers at a low cost while reducing a parts number and doubly monitoring abnormality in each of the microcomputers. The control device transmits a reset signal to a main microcomputer and resets the main microcomputer when a frequency of a first pulse signal deviates from a normal frequency range determined by a frequency calculating means, in which the first pulse signal is output from the main microcomputer, and the frequency calculating means calculates a frequency of the first pulse signal by an input of the first pulse signal to a sub microcomputer. The control device transmits a reset signal to the sub microcomputer and resets the sub microcomputer when a frequency of a second pulse signal deflects from a normal frequency range, by an input of the second pulse signal to the main microcomputer from the sub microcomputer.
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