PURPOSE: To form an empty space to be used effectively in a substrate.

CONSTITUTION: A first and a second movable contacts are formed in the inner face of a rice bowl-like part 31 to be pressed by a keyboard and corresponding to that, a pair of fixed contacts 8 corresponding to each key are formed on a substrate 4. A pair of a first and a second fixed contacts 8a, 8b having different diameter are formed almost concentrically for each pair of fixed contacts and leading wires 8d, 8d' of the second fixed contact pair 8b are drawn out between leading wires 8c, 8c' of the first fixed contact pair 8a. Each neighboring pair of the fixed contacts 8 is set almost symmetrically one another while the leading wire sides are set on the opposite one another and leading wires are so put as not to exist between the pairs.