A combination of a lid retaining structure and a power supply socket, wherein the power supply socket is equipped with a main body portion including a power supply terminal (44, 46) configured to supply electrical power from a battery of a vehicle by insertion of an external terminal through an entrance, and a lid configured to cover the entrance, wherein the lid retaining structure comprises: a handle of the vehicle; a component supporting section configured to support a component of the vehicle on the handle; and a stay configured to support the power supply socket on the handle; wherein the handle comprises a pipe handle supported steerably on a front portion of the vehicle, and a grip (18L, 18R) disposed on an end of the pipe handle and which is gripped by an occupant of the vehicle; the component supporting section supports the component on the pipe handle at a location closer to a vehicle body center than the grip (18L, 18R); the stay comprises at least one supported section (38a, 38b) supported on the pipe handle, a flat section jointly forming a gap between the pipe handle and the flat section and which extends upwardly from the at least one supported section (38a, 38b), and a main body supporting section, which is bent from the flat section so as to separate away from the handle, and configured to support the main body portion; the main body portion is supported on the main body supporting section so that the entrance is located above the main body supporting section; the lid is connected to the main body portion via a connecting part at a location above the main body supporting section; and characterised in that the lid, which is detached from the entrance, is retained in a space surrounded by the flat section, the pipe handle, and the component supporting section. a handle of the vehicle; a component supporting section configured to support a component of the vehicle on the handle; and a stay configured to support the power supply socket on the handle; wherein the handle comprises a pipe handle supported steerably on a front portion of the vehicle, and a grip (18L, 18R) disposed on an end of the pipe handle and which is gripped by an occupant of the vehicle; the component supporting section supports the component on the pipe handle at a location closer to a vehicle body center than the grip (18L, 18R); the stay comprises at least one supported section (38a, 38b) supported on the pipe handle, a flat section jointly forming a gap between the pipe handle and the flat section and which extends upwardly from the at least one supported section (38a, 38b), and a main body supporting section, which is bent from the flat section so as to separate away from the handle, and configured to support the main body portion; the main body portion is supported on the main body supporting section so that the entrance is located above the main body supporting section; the lid is connected to the main body portion via a connecting part at a location above the main body supporting section; and characterised in that the lid, which is detached from the entrance, is retained in a space surrounded by the flat section, the pipe handle, and the component supporting section.