A component supporting section (20) of a lid retaining structure (10) is supported on a pipe handle (16). and a stay (38) is supported on the pipe handle (16) via the component supporting section (20). A main body portion (40) of a power supply socket (24) is supported on a main body supporting section (38d) such that an entrance (50) is located above the main body supporting section (38d) of the stay (38). In the event that a lid (36) that covers the entrance (50) is removed, the lid (36) is retained in a space (62) surrounded by the flat section (38c) of the stay (38). the pipe handle (16), and the component supporting section (20).
