A plug-in switch fixing structure and a keyboard with the structure, and relates to the field of switch assembly technologies. The plug-in switch fixing structure includes a pin and a contact ring, where the pin is fixedly arranged on a corresponding structure, and the width of a middle portion of the pin is greater than the width of a lower end of the pin; when the pin is inserted into the contact ring, an inner side wall of the contact ring can squeeze the pin and abut against the pin; and the contact ring is fixedly arranged at a corresponding position. The keyboard includes a switch and a PCB, the switch is provided with a contact piece and a terminal, and the pin is fixedly arranged below the contact piece and/or the terminal; the PCB is provided with a hole, and the contact ring is located in the hole.

A key structure is provided. The key structure includes a switch and a keycap. The switch includes a stem. The keycap is located over the switch. The keycap includes a pressing surface, an inner bottom surface and a protrusion post. The pressing surface and the inner bottom surface are opposed to each other. The protrusion post is protruded downwardly from the inner bottom surface. The protrusion post includes an insertion groove and at least one exhaust recess. When the stem is tightly fitted into the insertion groove, a gap is formed between the at least one exhaust recess and the stem.

A key structure includes a keycap and an actuator. The actuator is coupled with the keycap and enables the keycap to move reciprocally along an actuating direction. One of the actuator and the keycap has a base and a slot formed therein, and the other one of the same has a plug. The plug is inserted into the slot in a direction parallel to the actuating direction. The slot has an inner wall pressing the plug and generating friction. The base has a first sidewall thickness perpendicular to the actuating direction and parallel to the inner wall and a second sidewall thickness perpendicular to the actuating direction and perpendicular to the inner wall, wherein the first sidewall thickness is greater than the second sidewall thickness. The disclosure can avoid the horizontal stress generated by the plug when it is inserted into the slot to squeeze against the bas.

A key structure includes a bottom plate, a first actuator and a keycap. The first actuator is disposed on the bottom plate and engaged with the keycap to make the keycap movably reciprocating along an actuating direction perpendicular to the bottom plate. Wherein, one of the first actuator and the keycap has a first slot; and the other one of the first actuator and the keycap has a first plug. The first plug is inserted in the first slot in parallel to the actuating direction. One of the first slot and the first plug includes at least one first protruding portion, which protrudes perpendicularly to the actuating direction and is conformally engaged with the other one of the first slot and the first plug.

A key structure includes a keycap and an actuator. The actuator is coupled with the keycap and enables the keycap to move reciprocally along an actuating direction. One of the actuator and the keycap has a base and a slot formed therein, and the other one of the same has a plug. The plug is inserted into the slot in a direction parallel to the actuating direction. The slot has an inner wall pressing the plug and generating friction. The base has a first sidewall thickness perpendicular to the actuating direction and parallel to the inner wall and a second sidewall thickness perpendicular to the actuating direction and perpendicular to the inner wall, wherein the first sidewall thickness is greater than the second sidewall thickness. The disclosure can avoid the horizontal stress generated by the plug when it is inserted into the slot to squeeze against the bas.