An exemplary keypad assembly includes: a printed circuit board (PCB) comprising a plurality of fixed contact points formed thereon, an elastic sheet disposed on the PCB, the elastic sheet comprising a base and many switches fixed on the base above the fixed contact points correspondingly; many key buttons, each key button comprising a main portion, and a pressing portion extending downward from the main portion; a light shielding sheet defining a plurality of through holes, the light shielding sheet integrally formed with the key buttons, the key buttons respectively passing through each of the through holes of the light shield sheet. The light shielding sheet with the key buttons is disposed above the elastic sheet, each pressing portion of each key button corresponding to each switch. The keypad assembly has a thin configuration due to a combination configuration of the light shielding sheet and the key buttons.