A support member for supporting a key cap, a keyswitch and a keyboard with the support structure are disclosed. The support member includes a first subunit and a second subunit. The first subunit includes a first arm which includes a first pivoting part at one end. The second subunit includes a third pivoting part connected to the first pivoting part temporarily. Therein, a second arm and a third arm are bended to extend from two ends of the third pivoting part respectively. There is a second position structure at an end of the second arm, and there is a third position structure at an end of the third arm. The second position structure and the third position structure can be connected to two first position structures on a base plate respectively. The distance between the second position structure and the position fixing structure is longer than that between the two first position structures.