The present invention disclosed a foldable mouse device comprising a power supply, a flexible connecting sheet, a contacting assembly, a flexible guiding sheet and a controller. The flexible connecting sheet is in contact with the power supply. One end of the contact assembly is connected to the flexible connecting sheet. One end of the flexible guiding sheet is located on one side of the contacting assembly. The controller is respectively connected to the flexible guiding sheet and the power supply. Wherein the flexible guiding sheet is in contact with the contacting assembly when the flexible connecting sheet and the flexible guiding sheet are folded. The flexible connecting sheet and the flexible guiding sheet are used to strengthen the structural strength of the internal circuit for avoiding being damaged or broken arisen from frequent bending and pulling when switching the circuit open and close by folding and unfolding the mouse device.