A foldable mouse including a first bottom plate, a second bottom plate, a first top plate, a second top plate, and two flexible side edge covers is provided. The first bottom plate and the second bottom plate are partially stacked together, and are suitable for relative movement. The first top plate has a first end and a second end, in which the first end pivots to a side of the first bottom plate away from the second bottom plate. The second top plate has a third end and a fourth end, in which the fourth end pivots to a side of the second bottom plate away from the first bottom plate. The two flexible side edge covers are connected to two side edges of the first top plate and the second top plate and two side edges of the first bottom plate and the second bottom plate.