The invention relates to an implant made in total or in parts of a biodegradable magnesium alloy consisting of Y: 2.0 - 6.0% by weight, Nd: 1.5 - 4.5% by weight, Gd: 0 - 4.0% by weight, Dy: 0 - 4.0% by weight, Er: 0 - 4.0% by weight, Zr: 0.1 - 1.0% by weight, Li:0 - 0.2% by weight, Al: 0 - 0.3% by weight, under the condition thata) a total content of Er, Gd and Dy is in the range of 0.5 - 4.0% by weight andb) a total content of Nd, Er, Gd and Dy is in the range of 2.0 - 5.5% by weight, the balance being magnesium and incidental impurities up to a total of 0.3% by weight.
