A charging port structure includes a guide plate, and is configured such that a release lever of a port cap can be prevented from being exposed to water even when water has flowed into a port housing. The guide plate receives water that has flowed into a port housing from the periphery of a port lid for covering a forward opening part of the port housing so as to be capable of opening and closing. The port housing surrounds a charging port having an end connection to which a charging connector for supplying electric power from an outside power source is connected, and guides the water away from where the release lever is disposed for opening the port cap for covering the end connection of the charging port so as to be capable of opening and closing. The guide plate is disposed above the charging port.