Switzerland is unique in its reluctance to join the EU. Indeed, all governments and parliaments in Europe have at least once in their history sought to become a member. This is not the case for Switzerland, which has never started accession negotiations and does not intend to do so soon. Currently the debate is between supporters of maintaining bilateral agreements with the EU and rejectionists who are even ready to give it up. Thus, paradoxically, the British Eurosceptics, who modeled the bilateral agreements between Switzerland and Switzerland, would appear in Switzerland as integrators. To clarify this very particular case, this chapter is based on an analysis grid composed of several levels of explanations (historical, political and economic). The results obtained show that the political theories of euroscepticism are not sufficiently developed to explain this Swiss phenomenon.