Key structure

A key structure, comprising:

• a base plate;
• a key cap disposed above the base plate, wherein the key cap comprises a bottom surface facing the base plate;
• a positioning base connected to the bottom surface of the key cap and comprising a positioning recess;
• a positioning cover slidably connected to the positioning base, wherein the positioning cover is inserted into the positioning recess, and the positioning cover comprises a bottom portion and a side wall connected to the bottom portion, wherein the bottom portion is in contact with the base plate;
• and a spring comprising a first spring portion and a second spring portion opposite to the first spring portion, wherein the first spring portion is boated in the positioning recess and is in contact with the bottom surface of the key cap, the second spring portion is located in the positioning cover and is in contact with the bottom portion of the positioning cover, and the first spring portion is located on a path on which the side wall of the positioning cover slides toward the bottom surface of the key cap;
• wherein an outer diameter of the first spring portion is greater than an inner diameter of the positioning cover.