PROBLEM TO BE SOLVED: To provide a power saving control device for minimizing a circuit scale or power consumption. SOLUTION: Each time a radio operation signal including an authentication code is received, whether or not the authentication code in the radio operation signal is a valid authentication code matching one of a plurality of first to N-th authentication codes stored in a memory is decided, and when it is decided that the authentication code in the radio operation signal is valid, an operation signal is output to a main device. The number of times when the received authentication code in the radio operation signal matches the first authentication code among the plurality of authentication codes stored in the memory is counted, and when the count value is equal to a predetermined set value (a), or when the authentication signal in the radio operation signal matches the second and following authentications among the plurality of authentication codes (b), a new authentication code is generated, and at least one of the plurality of authentication codes stored in the memory is erased, and the new authentication code is stored in the memory. COPYRIGHT: (C)2009,JPO&INPIT