A semiconductor device includes: first to Nth input terminals (where N is an integer equal to or greater than 2); and a redundant input terminal. When a Kth input terminal (where K is an integer ranging from 1 to N−1) is defective among the first to Nth input terminals, (K+1)th to Nth input terminals receive signals of Kth to (N−1)th input terminals, respectively, and the redundant input terminal receives a signal of the Nth input terminal.