A hinge structure including a fixing member, a rotating member and an extension member is provided. The rotating member is pivotally disposed on the fixing member, and the extension member is pivotally disposed on the rotating member, wherein the fixing member and the extension member are adapted to be fixed at two parts respectively. After the rotating member rotates relative to the fixing member along a rotating axial direction and the extension member rotates relative to the rotating member along the rotating axial direction, an included angle between the extension member and the fixing member presents an acute angle, so that the two parts are adapted to stand on a platform. The extension member and the fixing member are adapted to increase the included angle through an external force exerted towards the platform, until the included angle presents 180 degrees and the two parts construct a plane.