It is possible to maintain a base material made of magnesium or a magnesium alloy so as to prevent rapid degradation over a predetermined period after implanting. Provided is a biological implant (1) including a ceramic membrane (3) provided on a surface of a base material (2) made of magnesium or a magnesium alloy, wherein the total content of a metal element contained in the ceramic membrane (3), which has a standard electrode potential equal to or greater than -2.35 V and equal to or less than 0 V, is set to be equal to or less than a value at which the base material (2) can keep a desired mechanical strength over a healing period of an implant site in biological tissue.
