​​​​​​​​This study analyses the constructivist perspective of security and establishes the constructivist contribution to security studies, particularly in terms of the conventional and critical constructivist approaches, arguing that constructivism has constituted an intellectual turning point. It demonstrates how constructivism, or rather constructivisms, has enriched and developed the concept of security and security studies on three levels. First, it approaches security as social y constructed and intersubjective. Second, it has undertaken a critical revision of major rationalist concepts, notably anarchy and the security dilemma. Third, it has introduced concepts of identity, interests, and norms to the field of security studies. However, there are shortcomings in the constructivist contribution on identity and security, in addition to inter-constructivist disagreements, which have prevented the evolution of a clear theoretical framework, even within critical constructivism, which has made the most innovative contributions to the field. The study concludes that constructivism has not formulated a distinct theory of security. However, its innovative contributions and its role as a theoretical reference point for new approaches to security constitute a constructivist perspective within International Relations. Both critical and non-critical strands of the new security approach have developed security theories grounded in constructivist insights. This constitutes the central theoretical achievement of constructivism in the field of security studies.​​