The purpose of this paper is to provide an overview and characterisation of the rejection of the European Constitutional Treaty by a majority of voters in France's referendum held on 29 May 2005. Whilst pointing to the salience of political discontent with the incumbent right-wing government and some elements of the longstanding crisis in French national party politics, the analysis places the emphasis on the central role played by social issues in the referendum, the transposition at the European level of the mechanism of the evaluation by voters of traditional parties' performances and responsiveness to the country's social malaise and the unilateral termination by a majority of left-wing voters of the social welfare and economic growth confidence pact that they had made with their national political elites on the occasion of the Maastricht referendum in 1992;