A switch seat body structure and a manufacturing method thereof. The switch seat body structure is simplified and can be easily manufactured to enhance the resistance of the switch seat body against the external damaging force. The switch seat body structure includes a main body for assembling with an internal component of the switch. The main body is an assembly of a metal head section and a nonmetal belly section. The metal head section has a shoulder section, a skirt section connected with the shoulder section and a subsidiary shoulder section formed on the skirt section. The nonmetal belly section is overlaid and connected on at least a part of the skirt section or the entire skirt section, whereby the nonmetal belly section is connected with subsidiary shoulder section to form an integrated structure.

A data entry and/or operating system, particularly a keyboard, also a POS keyboard, includes a lower part and an upper part as well as at least one circuit board and at least one retainer plate, the retainer plate lying on the lower part. One or more bushings are integrated for the purpose of connecting the circuit board to the retainer plate. The upper part is formed from a rubber mat having keys, and the stability of the keyboard is assured by the circuit board, bushing and metal retainer sheet. The lower part is connected to the upper part in a sealed manner.