A power storage pack authentication method characterized in that the method comprises: transmitting, by a controller of an electric movable body, a signal including identification information identical to identification information retained in a first power storage pack via near-field communication when the first power storage pack is detached from the electric movable body; after a controller of a charging device receives the signal transmitted via the near-field communication and after the first power storage pack detached from the electric movable body is mounted in a first charging slot (SLcl) of the charging device, transmitting via wire, by the controller of the charging device, the identification information received from the electric movable body to a controller of a second power storage pack which is replaceable with the first power storage pack and which is mounted in a second charging slot; transmitting via near-field communication, by the controller of the second power storage pack, a signal including the identification information received from the charging device after the second power storage pack detached from the second charging slot is mounted in the electric movable body; and collating, by the controller of the electric movable body, whether or not the identification information included in the received signal matches the identification information retained in the first power storage pack after the controller of the electric movable body receives the signal transmitted via the near-field communication, and authenticating that the second power storage pack mounted in the electric movable body is identical to a partner device communicating via the near-field communication when the identification information included in the received signal matches the identification information retained in the first power storage pack. transmitting, by a controller of an electric movable body, a signal including identification information identical to identification information retained in a first power storage pack via near-field communication when the first power storage pack is detached from the electric movable body; after a controller of a charging device receives the signal transmitted via the near-field communication and after the first power storage pack detached from the electric movable body is mounted in a first charging slot (SLcl) of the charging device, transmitting via wire, by the controller of the charging device, the identification information received from the electric movable body to a controller of a second power storage pack which is replaceable with the first power storage pack and which is mounted in a second charging slot; transmitting via near-field communication, by the controller of the second power storage pack, a signal including the identification information received from the charging device after the second power storage pack detached from the second charging slot is mounted in the electric movable body; and collating, by the controller of the electric movable body, whether or not the identification information included in the received signal matches the identification information retained in the first power storage pack after the controller of the electric movable body receives the signal transmitted via the near-field communication, and authenticating that the second power storage pack mounted in the electric movable body is identical to a partner device communicating via the near-field communication when the identification information included in the received signal matches the identification information retained in the first power storage pack.