Key structure

A key structure, comprising:

• a circuit board comprising a switch and a peripheral region, wherein the peripheral region is located adjacent to the switch;
• a triggering part aligned with the switch;
• and
• an elastic element comprising an upper support portion, a lower support portion, an upper elastic portion and a lower elastic portion, wherein the lower support portion is located beneath the upper support portion, and connected to the peripheral region of the circuit board, wherein the upper elastic portion is connected between the triggering part and the upper support portion, and the lower elastic portion is connected between the upper support portion and the lower support portion, wherein the lower elastic portion comprises a first section and a second section connected to each other, and an angle between the first section and the second section is larger than 120 degrees and smaller than 180 degrees, wherein the first section is connected to the upper support portion, and the second section is connected to the lower support portion, and there is a vacant space between the second section and circuit board.