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In this article, we examine the role of "Unions of employers" in the production of the collective agreement architecture of the non-profit health, social and medico-social sector. The socio-history of the employers’ unions that we carry out in this text allows us to understand their divisions and how this contributed to the splintering of this sector into different national collective agreements (NCA) during the 1960s to 1980s, before they joined forces and created a professional branch in 1993. In the years that followed, relations between employers’ organizations were turbulent, but in recent years they have finally converged on the project of a single, comprehensive NCA. Following these developments allows us to observe what this associative employer can do, but also that the State remains the main financer and regulator of this professional sector and that it actively participates in the production of rules.