The depletion of water resources, global warming, soil erosion, atmospheric pollution and other environmental degradation that the world has experienced in the recent decades has made it necessary to emerge and spread the notion of sustainable development. Thus, by constraint or by opportunity, company managers are today increasingly led to integrate sustainable development practices into their strategies, through the concept of corporate social responsibility, to ensure the sustainability of their companies, ultimately reduce the industrial and ecological risks linked to their activities and thus strengthen their competitiveness. In this manner, the manager within the SME has a key role in the company management system. Therefore, the environmental commitment of SMEs could be interpreted in terms of the personal characteristics of the manager. This paper’s goal is to shed light on the influence of manager’s profile on the environmental commitment of small and medium-sized Moroccan companies. To achieve this, we have theoretically delimited our research by proposing an inventory of the main concepts and theories used. We also used a qualitative research method to answer our main question. It was carried out in the form of semi-structured interviews with 24 SME managers. Our findings show that environmental commitment of the SMEs is greatly influenced by the values of the manager, especially those of self-transcendence and openness to change. Moreover, the managers who have received environmental training are more inclined to engage in environmental practices. After all, our research results highlight the usefulness of targeted strategies and training in the environmental field from the State for the benefit of these managers.