A communication sheet structure for transmitting electromagnetic waves, and thereby performing communication, is characterized in that the communication sheet structure includes a planar base material with a relative dielectric constant at a frequency of from 800 MHz to 10 GHz of from 1.0 to 15.0, and one side of the base material includes conductor A existing portion and non-existing portion, and the other side of the base material includes a conductor B existing over 90% or more thereof. The communication sheet structure enables communication in two dimensions, and the communication sheet structure is extremely excellent in communication performances.