Security barrier comprising at least one barrier structure (10) and at least one gate (1), wherein the barrier structure (10) comprises one or more bottom panels (20) and the gate (1) forms a closable passage through the security barrier and wherein the gate (1) comprises at least one base element (2), wherein in installed state of the security barrier one or more of said one or more bottom panels (20) rest upon the at least one base element (2), such that the gate (1) is at least partly held in place by the barrier structure (10) and gate (1) for a such security barrier.