A decoder circuit comprises: first decoder section that decodes an m-bit address signal portion of an (m+n)-bit address signal; and a second decoder section that decodes an n-bit address signal portion of the (m+n)-bit address signal, the first decoder section including a first AND operation circuit section that outputs signals that indicate a decoding result of the m-bit address signal portion, and a second AND operation circuit section that outputs signals that indicate a decoding result of part of the m-bit address signal portion, and the second decoder section including a third AND operation circuit section that outputs signals that indicate a decoding result of the n-bit address signal portion, and a fourth AND operation circuit section that outputs signals that indicate a decoding result of part of the n-bit address signal portion.