To provide a manufacturing and control technique of a practicable metamaterial.

In an aspect of the invention, a resonator 100 for a metamaterial 1000 which is held by a supporting medium and acts on an electromagnetic wave includes: a core component 10; and several peripheral components 20 arranged in contact with the core component along a ring having a diameter shorter than an operation wavelength of the electromagnetic wave. Each of the peripheral components has a size equal to or smaller than the size of the core component, and acts as an electric circuit for the electromagnetic wave of the operation wavelength. In another aspect of the invention, there is provided a resonator array comprising a plurality of the above-described unit resonators 100.