Patent ID: 8210427

Claim:
An authentication device, comprising: a non-contact IC reader which reads identification data stored in a non-contact IC; a non-contact IC displacement direction detection device which detects first and second displacement direction of the non-contact IC after the non-contact IC reader has read the identification data; and an authentication determination device which stores permitted identification data and permitted displacement data on displacement directions of the non-contact IC given for each permitted identification data, and determines whether or not authentication is to be made based on the permitted identification data, the identification data stored in the non-contact IC, the permitted displacement data, and the first and second displacement directions detected by the non-contact IC displacement direction detection device, the permitted displacement data including permitted first displacement data, permitted second displacement data, and permitted ordinal data, the permitted ordinal data representing the first displacement direction which is firstly detected and the second displacement direction which is detected subsequent to the first displacement direction.