An electronic device includes a first machine body and a second machine body adapted to be detachably assembled to the first machine body. The first machine body includes a first casing, a first hinge fixed to a side of the first casing, a second hinge pivoted to the first hinge along an axis, and a first connecting member disposed at the side and linked to the second hinge. The first and the second hinges are covered by the first casing. The second machine body includes a second casing and a second connecting member. When the first machine body is assembled to the second machine body, the first connecting member is fixed to the second connecting member, the second hinge is fixed jointly so that the first hinge is rotatable related to the second hinge. Accordingly, the first casing is rotatable related to the second casing.