To provide an electronic key and an individual setting device, allowing flexible setting of the electronic key specification.

A motion sensor 21 is mounted in an electronic key 2 which is shaken a set number of times to set its specification. The specification of the electronic key 2 is set in accordance with the number of shaking. Upon wireless communication between the electronic key 2 and the vehicle 1, the vehicle 1 is notified of the specification information Sbs of the electronic key 2 so that an environment for the vehicle is set to be in accordance with the specification of the electronic key 2.