The invention relates to a security device comprising a security element composed of: a carrier substrate (1) provided with at least one optically variable effects generating structure (2) situated in defined areas of the said carrier, a first reflective layer (3) visible at least where it coincides with the said optically variable effects generating structures (2) and comprising a reflection enhancing material, at least one second distinctive reflective layer (4) situated only outside the optically variable effects generating structures (2) and comprising a reflective material different from that of the first layer (3). These layers (3,4) can comprise further patterns (7).The invention relates to a security support (9) or document comprising the said security device too.