The aim of this paper is to present the main ideas that could form the core of the Post-Keynesian approach to the analysis of labour demand at both micro-and macroeconomic levels. Specifically, this paper first reviews the essential elements characterising the Post-Keynesian approach to microeconomic analysis of labour demand. To do this, the "traditional view" is first presented, associated with the concept of the firm characterised by the presence of fixed technical coefficients and capacity reserves, and then the essential features of an alternative and more innovative view are described, based on the concept of the firm that emanates from the competence-based theories of organisation. Subsequently, the core of the Post-Keynesian contributions at the macroeconomic level is presented, organising them into two sections: first, those contributions that break away from the "second classical postulate" and second, those that additionally steer away from the "first classical postulate". Finally, the paper summarizes the main ideas that could be the core of the post-Keynesian approach to the analysis of labour demand, both in micro-and macroeconomic fields. JEL Classification: J23, E24, B59 scope (traditionally left behind in the Postkeynesian views), and highlighting the coherence between both. Secondly, by overlapping and interrelating two alternative classifications of the Postkeynesian vision within the macroeconomic field. Thirdly, by trying to summarize and raise the basic ideas that could constitute the "core" of the Postkeynesian approach to labour demand, in both micro-and macroeconomic fields.However, it is also possible to find several common elements within those different theoretical approaches; these elements also lead to a significantly different analysis of labour demand from that of the more orthodox economics. In this context, the aim of this paper is to present, in an abridged and more or less structured and comparable way with the orthodox view, the main ideas that form the core of the Post-Keynesian approach to the analysis of labour demand. The hope is that this comparison will not only contribute to dissemination of this approach but also to its discussion and development. To this end, this paper is organised in two sections. The first one reviews the essential elements characterising the Post-Keynesian approach to microeconomic analysis of labour demand. In particular, it first presents what might be called the "traditional view" (which is associated with a particular understanding of the firm characterised by the presence of fixed technical coefficients and capacity reserves), and secondly summarises the essential features of an alternative and more innovative view, based on the notion of the firm offered by the competence-based theories of organisation. In the second section, the heart of the Post-Keynesian contributions to the analysis of labour demand from the macroeconomic point of view is discussed and is organised in two directions: those contributions that imply a breach of the "second...