A history of the Peugeot plant near Montbeliard, where the employees outnumber the inhabitants of the commune which shares its name. constructed from a sociological viewpoint. The three sections, based on first-hand research, cover the experience of working on a production line in the factory at the time of writing, its growth and development between 1948 and 1970, and the later stages (1970-1992) when its growth faltered and then fell back, enshrining the memories of the older workers about its heyday and their attitude to the changes. In the original French.