An artificial dielectric resonator that can enhance a relative dielectric constant in a basic mode is provided. The artificial dielectric resonator 1 has a first series metal strip group 2 including a plurality of metal strips 20 each in a thin sheet shape arranged with microscopic gaps 20G provided in a longitudinal direction, and a second series metal strip group 3 including a plurality of metal strips 30 each in a thin sheet shape arranged with microscopic gaps 30G provided in a longitudinal direction, the first series metal strip group 2 and the second series metal strip group 3 are disposed close to each other in a thickness direction of the metal strips 20 and 30, and the metal strip 20 or 30 of one metal strip group 2 or 3 is disposed to face and cross gap 30G or 20G of the other metal strip group 3 or 2.