An antenna unit by which a noncontact IC tag having different resonance frequencies can be easily manufactured, and the noncontact IC tag are provided. The circular drive case provides efficient space utilization in typically cramped confines in and around a wheeled vehicle. The arms have a lower member and an upper member, which are connected to each other at an angle. Each static corner and corresponding descriptor is stored in a memory, and each static corner is classified as a background or foreground according to the descriptor to model a background in the video. The first user also selects a communication type. Use of this catalyst makes it possible to increase the electron donating ability toward a transition metal.