There is provided an electronic device having a terminal port disposed at a side surface of a casing and opened outward; and a lid that openably covers the terminal port. The terminal port includes: a back wall on which connection terminals are mounted; a bottom wall; and a pair of side walls. The lid includes a slide support that is supported slidably inward and outward along the bottom wall and a lid main body that is turnably supported at the outer edge of the slide support by a hinge. The slide support is located at its initial position at which the slide support slides inward when the lid is closed. The slide support is allowed to slide outward and the hinge is located outward of the outer edge of the bottom wall when the lid is opened.