Metal grating for X-rays, production method for metal grating for X-rays, metal grating unit for X-rays, and X-ray imaging device

An X-ray metal grating structure comprising a grating-forming workpiece having one surface formed with a grating region in which a plurality of first structural portions are provided,

• wherein the grating region comprises:
• the plurality of first structural portions, a plurality of second structural portions located in a first part of the grating region different from a second part of the grating region where the plurality of first structural portions are located, and at least one air gap located in a third part of the grating region different from the first part and the second part, the at least one air gap being formed between adjacent ones of the first and second structural portions;
• and
• wherein each of the first structural portions and each of the second structural portions are made, respectively, of first and second grating region materials each having a respective one of mutually different first and second characteristic values of a given characteristic with respect to X-ray, wherein at least one of the first and second grating region materials is a metal.