Small and medium–sized enterprises play an important role in the economy in Europe. Consequently, their contribution to the realisation of sustainable development is also important. After briefly discussing the role of Corporate Social Responsibility in “getting closer to” sustainable development, the specialties of SMEs’ CSR are listed. The results and conclusions of a questionnaire survey among Hungarian SMEs with good environmental practices are presented, discussing their motivating factors and the challenges they face, the main stakeholders influencing their CSR performance including their MNE customers. The geographical and company size focus of the survey enables investigation of CSR in Central and Eastern Europe from a new perspective, completing the results of resent surveys on bigger samples among large companies with some minor but interesting aspects.