A handheld electronic device, comprising: a first body; a second body; a sliding module, disposed between the first and second bodies (110, 120) for driving the first body and the second body transforming between a retracted state and a spreaded state, the sliding module comprising: a sliding member, disposed on the first body, wherein the sliding member has an opening, and when the first body and the second body are configured in the spread state, a part of the opening is exposed; a fixing member, disposed on the second body, wherein the sliding member is slidably coupled to the fixing member; a driving member, connected between the fixing member and the sliding member; a flexible electrical connecting member, passing through the opening and connected between the first body and the second body; and a shielding member, coupled to the driving member, wherein the driving member is arranged for driving the shielding member, wherein the shielding member, when driven by the driving member, is arranged to slide with respect to the sliding member, wherein when the shielding member is sliding with respect to the sliding member, the shielding member is adapted to shield the part of the opening when the first body and the second body are transformed from the retracted state to the spread state; characterized in that the driving member is an elastic module adapted to semi-automatically push the first body away from the second body to achieve the spread state and semi-automatically draw the first body back to the second body to achieve the retracted state, and the driving member has a guiding pin, the shielding member has a sliding slot, and the guiding pin is slidably disposed in the sliding slot. a first body; a second body; a sliding module, disposed between the first and second bodies (110, 120) for driving the first body and the second body transforming between a retracted state and a spreaded state, the sliding module comprising: a sliding member, disposed on the first body, wherein the sliding member has an opening, and when the first body and the second body are configured in the spread state, a part of the opening is exposed; a fixing member, disposed on the second body, wherein the sliding member is slidably coupled to the fixing member; a driving member, connected between the fixing member and a sliding member, disposed on the first body, wherein the sliding member has an opening, and when the first body and the second body are configured in the spread state, a part of the opening is exposed; a fixing member, disposed on the second body, wherein the sliding member is slidably coupled to the fixing member; a driving member, connected between the fixing member and the sliding member; a flexible electrical connecting member, passing through the opening and connected between the first body and the second body; and a shielding member, coupled to the driving member, wherein the driving member is arranged for driving the shielding member, wherein the shielding member, when driven by the driving member, is arranged to slide with respect to the sliding member, wherein when the shielding member is sliding with respect to the sliding member, the shielding member is adapted to shield the part of the opening when the first body and the second body are transformed from the retracted state to the spread state; characterized in that the driving member is an elastic module adapted to semi-automatically push the first body away from the second body to achieve the spread state and semi-automatically draw the first body back to the second body to achieve the retracted state, and the driving member has a guiding pin, the shielding member has a sliding slot, and the guiding pin is slidably disposed in the sliding slot.