An electronic device includes a terminal cover that closes an opening. The opening is provided in a casing and houses a connection terminal. The terminal cover includes a lid, a fixing part for fixing the lid to the casing, and a slider mounted on the lid and slidable in a predetermined sliding direction. The lid is coupled to the fixing part in the sliding direction. The slider has first engagement parts provided at an end of the slider in the sliding direction, and has second engagement parts provided at each end in a direction orthogonal to the sliding direction. When the slider is located at a predetermined lock position in a state in which the terminal cover is closed, the casing has third engagement parts engaged with the first engagement parts and fourth engagement parts engaged with the second engagement parts.