The article provides an analysis of political party system of the Republic of Estonia in the mid-2010s. The analysis is based on the works of Moris Duverger. As one might expect, the establishment of proportionate electoral system in Estonia has resulted in the formation of a multi-party system, in which no single party dominates in the parliament even in a short run. The article demonstrates that though Estonian political party system develops in line with the tendencies typical to political party systems of most European countries, some of its elements are more common to postcommunist countries. It indicates that the political party system in Estonia has stabilized throughout the past decade. Today, five sixths of voters support one of th...