Radio IC device and radio communication terminal

A radio IC device comprising:

• a radio IC element arranged to process a high-frequency signal;
• a substrate on which the radio IC element is mounted;
• a planar conductor arranged on a first surface of the substrate;
• and
• a first wiring electrode and a second wiring electrode including respective first ends connected to a pair of input/output electrodes of the radio IC element;
• wherein
• the first wiring electrode and the second wiring electrode are arranged on a second surface of the substrate, the second surface being parallel or substantially parallel to the first surface, and including respective second ends electrically connected to the planar conductor;
• and
• the first wiring electrode and the second wiring electrode define loops when looking at the substrate from X-, Y- and Z-directions orthogonal to one another.