In an electronic device, a socket side first fitting part and a socket side second fitting part, which constitute one shape of a recess and a projection, are formed near a hinge on a principal surface of a socket of a second unit from which a first unit is detachable. In a state in which a principal surface of an input unit and a principal surface of the socket are substantially parallel to each other, an input unit side first fitting part and an input unit side second fitting part, which constitute another shape of the recess and the projection, are formed on the principal surface of the input unit so as to respectively fit to the socket side first fitting part and the socket side second fitting part of the socket.