To provide flat antenna equipment of which the development cost can be made low.

The flat antenna equipment having a substrate 4 installed on one surface of a dielectric 1 has a recess 2 formed on the surface where the substrate 4 is installed, and is provided with a shield member 3 on the exposed surface of the recess 2. The substrate 4 has a circuit pattern 6a packaging circuits 7b provided on the installation surface to the dielectric 1 and has an outer radiation electrode 6b and an inner circuit grounded electrode 6a, which are connected in at least one position, provided on a surface opposite to the installation surface to the dielectric 1. The substrate 4 is installed on the dielectric 1 with a joining member like a detachable double-sided (adhesive) tape so that circuits 7b mounted on the substrate 4 through the circuit pattern 6a are stored in the recess 2 formed on the dielectric 1, and the shield member 3 and the circuit grounded electrode 6a are electrically connected at a prescribed pitch.