An electronic device includes a first body, a second body, a hinge assembly, and a linkage assembly. The first body has a first pivoting end. The second body includes first and second casings slidably disposed on each other. The first casing has a second pivoting end. The hinge assembly has a first axial portion, a second axial portion, and a connection portion. The first and second pivoting ends are pivotally connected to the first axial portion and the second axial portion, respectively. The connection portion does not overlap the second axial portion along an axial direction. The linkage assembly is connected between the connection portion and the second casing. When the hinge assembly rotates along the second axial portion relative to the first casing to drive the first body to be unfolded, the linkage assembly drives the second casing to slide, so that an end of the second casing protrudes.