An object is to advantageously control a phase of an electromagnetic wave with high efficiency at target operational frequency band. A phase control device (10) comprising a two-dimensional array of three-dimensional units (101) and configured to shift a phase of an electromagnetic wave passing through the three-dimensional units (101). The two nearest three-dimensional units (101) having same phase shift coverage are configured such that the distance difference from phase center of the phase control device (10) to the units (101) is a wavelength of a reference frequency fk, and the reference frequency fk is higher than center frequency fc of operational frequency band and not higher than the highest frequency fh of the operational frequency band.