Key structure and elastic conduction element thereof

A key structure, comprising:

• a membrane switch;
• a keycap located over the membrane switch, wherein the keycap is movable upwardly or downwardly relative to the membrane switch;
• and
• an elastic conduction element arranged between the keycap and the membrane switch, and comprising a supporting cover and a single conduction post, wherein the supporting cover comprises an accommodation space, the conduction post is connected with the supporting cover and disposed within the accommodation space, and the conduction post comprises a first contacting part, a second contacting part and a concave part, wherein the concave part is arranged between the first contacting part and the second contacting part, the second contacting part is arranged around the concave part, and the concave part is arranged around the first contacting part,
• wherein while the keycap is moved downwardly relative to the membrane switch, the supporting cover is compressed by the keycap and the conduction post is correspondingly moved downwardly, wherein while the conduction post is moved downwardly, the first contacting part and the second contacting part are contacted with the membrane switch and a suction force between the concave part and the membrane switch is generated.