An electronic device including a first module, a second module, at least one first spacer, and at least one second spacer is provided. The first module has a carrying surface. The second module is slidably disposed on the carrying surface and has a bottom surface opposite to the carrying surface. The first spacer is fixed on the carrying surface and suitable for being slid on the bottom surface. The second spacer is fixed on the bottom surface and suitable for being slid on the carrying surface. The first spacer and the second spacer are always kept within an overlapping region between the bottom surface and the carrying surface.