A connector includes a plug connector including a projecting part and a plurality of plug electrodes, each plug electrode includes a first surface and a second plug surface that are substantially parallel to each other, and a jack connector including a plurality of jack electrodes, each jack electrode contacts to one of the plug electrodes when the plug connector is engaged with the jack connector, that includes a first jack contact part that contacts with the first plug surface, a second jack contact part that contacts with the second plug surface, and a third jack contact part that contacts with the projecting part. The projecting part is configured to exert a force to the third jack contact part to move the first jack contact part toward the first plug surface when engaging the plug connector and the jack connector.