Abstract: The invention discloses an ultra-thin keypad for cooperating with a circuit board in a portable electronic device. The circuit board includes a plurality of switches. The ultra-thin keypad includes a main body, a plurality of buttons, and a plurality of thin walls. The buttons are disposed on the main body, and each of the buttons corresponds to one of the switches. The thin walls are disposed between adjacent ones of the buttons. When one of the buttons is pressed, the button contacts and activates the corresponding switch by the elastic deformation of the thin walls. The main body, the buttons, and the thin walls are manufactured integrally by injection molding.