An electronic device includes a first body, a pivot assembly and a second body. The first body includes a first side and a second side, and the second side includes a groove. The pivot assembly includes a container, a first gear, a second gear and a third gear. The container includes an accommodating space and a side wall. The first gear is disposed in the accommodating space and connected to the groove. The second gear is disposed in the accommodating space, pivotally disposed at the side wall and engaged with the first gear. The third gear is disposed in the accommodating space, pivotally disposed at the side wall and engaged with the second gear. The second body is pivotally disposed at the container and connected to the third gear.