To provide a communication sheet structure that is used in combination with an IC tag, has stable read rate and can be easily introduced and installed on an existing shelf, and also an information management system using the same.A communication sheet structure comprises at least three layers of a conductor layer A, a base member layer and a conductor layer B described below, which are laminated in order, wherein the size of the communication sheet structure in the direction of width thereof at right angles with the direction in which the transmitted electromagnetic waves travel in a plane thereof is nearly equal to a natural number of times of one-half the wavelength of the transmitted electromagnetic waves so as to establish a resonating state in the direction of width: conductor layer A: a layer in which continuous, conducting portions A and nonconducting portions A are present, the conducting portions A having an electric resistance of not larger than 1 Ω/□; base member layer: a layer of a resin molded body or a fiber structure having a relative dielectric constant of 1.0 to 5.0 at a frequency of 800 MHz to 10 GHz; conductor layer B: a layer in which a conducting portion B is present over not less than 90% of the area thereof, the conducting portion B having an electric resistance of not larger than 1 Ω/□.