A structure for a handheld device with a function of electrostatic discharge (ESD) protection has a circuit member (230), a displaying member (240), and a conductive supporting frame (250) with a hollow region (251). The circuit member and the displaying member are affixed to the conductive supporting frame at the hollow region to construct a subassembly (300). The subassembly is then mounted in a housing (202) consisting of upper and lower housings (210,212) at a location that the conductive supporting frame is just beside a gap (203) between the upper and lower housings. ESD-sensitive components (231,232) on the circuit member and the displaying member are surrounded by the conductive supporting frame, whereby ESD entering the housing via the gap which may cause a harm to the ESD-sensitive components and the displaying member is absorbed by the supporting frame and transmitted to ground via an electrical connection between the supporting frame and ground trace of the circuit member. The handheld device can be a personal digital assistant.