抄録

　本論文は,2003年総選挙の公約データを用いて,「政党・政策中心の選挙」の現状と政党内における政策的な分散を説明する「選挙制度不均一モデル」を検証する.前者については,自民党と民主党,二大政党間の政策的な違いは大きいといえず,両党内の政策的な凝集性も低いことを示した.また,「選挙制度不均一モデル」が予測する衆議院と都道府県議会において異なる選挙制度の効果については,系列関係の程度や地方議会選挙における競合のあり方に応じて,国政レベルの政策対立が末端まで浸透しないことを部分的に確認した.

abstract

In this paper, we clarify whether party/policy-centered electoral competition has been realized and examine the "inconsistent electoral system" model by analyzing candidate platform data of 2003 general election. The differences of policies between Liberal Democratic Party (LDP) and Democratic Party of Japan (DPJ), which are major two parties in Japan, are not large and intra-party policy cohesion is low. As for the effect of different electoral systems of Diet and Local Assembly, it was partially confirmed that policy competitions at national level did not penetrate those at the local level. This is due to the strength of affiliated relation (Keiretsu) between Diet members and Local Assembly members and the different types of competition in Local Assembly elections.