PROBLEM TO BE SOLVED: To provide a charging connector connection determination method and a charging connector connection determination device capable of reliably determining whether or not a charging connector is connected to an electric vehicle. A charging connector connection determination method for determining whether or not a charging inlet 20 of an electric vehicle 100 is connected to a charging connector 210 provided on a charging cable 200. The vehicle 100 is provided at the charging inlet 20 and includes a lock pin 32 that can move forward and backward and engages with the charging connector 210 to lock the engaged state. The lock pin 32 has a first state in which the charging connector 210 can be attached, a second state in which the charging connector 210 is located on the advance direction side of the first state and engages with the charging connector 210, and a second state in which the lock pin 32 advances from the second state. The charging connector 210 can be connected by moving the lock pin 32 in the advancing direction and detecting the state of the lock pin 32, which is located on the directional side and can be displaced to a third state that hinders the attachment of the charging connector 210. Judge the presence or absence of. [Selection diagram] Fig. 1
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