To enable application of a post-installing anchor having high durability and capable of attaining lead- or hexavalent chromium-free.

In the post-installed anchor including a substantially cylindrical expansion sleeve having a plurality of slits formed at substantially equal intervals on a cylindrical circumferential wall part and a cone nut to be inserted to the expansion sleeve, the expansion sleeve is formed of pure zinc, zinc containing 4.3% or less of aluminum by weight ratio, or zinc containing 4.3% or less of aluminum alloy by weight ratio.