Key assembly and keyboard

A keyboard, comprising:

• a housing, wherein the housing surrounds an internal space, and a keyhole is disposed on the housing;
• and
• a key assembly, wherein the key assembly comprises a support plate, a flexible circuit board, a buffer block and a pressing assembly;
• the support plate has a first surface and a second surface that are opposite to each other, the support plate has an accommodating portion, and the accommodating portion limits an accommodating groove, and wherein the first surface in the accommodating portion is level with the second surface outside of the accommodating portion;
• wherein the flexible circuit board is superposed on the first surface, and the flexible circuit board has a through hole that is correspondingly connected to the accommodating groove;
• wherein the buffer block is disposed in the accommodating groove on the first surface, and passes completely through the through hole;
• and the buffer block has a buffer support surface that protrudes from the flexible circuit board;
• wherein the pressing assembly comprises a keycap, a support mechanism, and a connecting rod;
• the keycap is movably supported on the support plate by using the support mechanism in a manner that the keycap is able to be pressed or rebound;
• and the connecting rod is connected to the keycap, and at least a part of the connecting rod corresponds to the buffer block;
• and
• wherein the key assembly is installed in the internal space, and the keycap protrudes out of the internal space through the keyhole.