An elastic-cup support for keyboard is in the form of a flat locating sheet located on a membrane-type switch circuit board of the keyboard, and provided at positions corresponding to membrane-type switches on the circuit board with receiving holes for separately receiving an elastic cup therein. Each of the receiving holes is provided with an upward projected wall portion to confine the elastic cup to the receiving hole. The wall portion is optionally provided with at least one notch having a lug radially inward extended therefrom, such that the elastic cup confined by the wall portion is also pressed against the at least one lug to fixedly located in the receiving hole on the flat locating sheet. Alternatively, the wall portion may be provided at an upper edge with at least one radially inward projected lug to prevent the elastic cup from separating from the receiving hole.