Abstract: A push button of a notebook computer key has a plate portion, a hook projection extending downward from the plate portion and having a distal outward hook end, and a conductive member spaced vertically downward from the plate portion. The hook projection extends into an upright hollow confining wall of a socket member. The top end of the socket member is provided with an inwardly extending peripheral flange to hinder movement of the distal hook end out of the receiving space to prevent detachment of the push button from the socket member. A circuit board is provided on a lower end of the socket member. An upright hollow guide projection extends from the circuit board and into the hollow confining wall of the socket member. The conductive member is disposed inside the guide projection.