The decline in the power of the Liberal Democratic Party is a key reason behind the string of short-lived administrations over the past decade, according to former Prime Minister Yasuhiro Nakasone.

The successor to Prime Minister Yoshiro Mori to be selected Thursday will be the 11th prime minister since Noboru Takeshita took the state helm in November 1987 after Nakasone's five-year reign.

"The style of politics followed by the LDP during the postwar era is now showing signs of metal fatigue," Nakasone said in a recent interview with The Japan Times.