To provide an anchor material which can be fitted to an RFID (Radio Frequency Identification) tag by using the same anchor material even when thicknesses and sizes are different in fitting the RFID tag embedded in a concrete structure, a structural member, or the like.

In the anchor material, a vertical material bending a horizontal material extending horizontally toward the outside from one end edge of a flange forming a channel shape material in the vertical direction from the end edge of the horizontal material is installed, and a hollow part fixing the RFID tag by the flange, the horizontal material, and the vertical material is formed.