PROBLEM TO BE SOLVED: To provide an alveolar bone regeneration guiding membrane excellent in handleability.SOLUTION: An alveolar bone regeneration guiding membrane 1A comprises multiple through-holes 2 having extracellular fluid permeability and cellular tissue impermeability and is made of metallic foil having shape retaining properties and biocompatibility. At least one of both side edges of the alveolar bone regeneration guiding membrane 1A includes: a first side edge 51 that is located on a side of one end 5a thereof a second side edge 52 that is located outside more than the first side edge 51 and is located on a side of another end 5b and a third side edge 53 that is located between the first side edge 51 and the second side edge 52 and is inclined outward as it approaches the second side edge 52 from the first side edge 51.
