Security Element for document Secure

The security element (10) for secure document, comprising: - a support (11) at least partially transparent, - a first securing structure (12) carried by the support and defining at least a first pattern visible in transmitted light, second safety structure (14,15) carried by the support and being superimposed at least partially to the first structure (12) comprising a masking layer (14) not opaque and a pattern layer (15) non-diffusing and non opaque, outwardly overlying the masking layer (14) and defining by contrast therewith, at least a second visible pattern in reflection on the side of the pattern layer (15).