Very simple touch key ESD protection circuit is employed with the circuit configuration circuit and a very simple circuit configuration proposes an electrostatic protection circuit integrated in a single device by the touch key of applying the composite circuit element. In the illustrated touch key circuits touch key circuit including an integrated circuit for sensing a touch pad part, and having an internal terminal connected to a touch key on the touch key operation whether a capacitive touch key having, connected to a touch key with him resistance provided between the inner terminal of the integrated circuit, and an end on the grounded electrostatic protective element connected to at least the touch key from the ends of the resistor. Composite element is shown in which a plurality of sheets laminated body, forming the body is formed in the first external terminal, a body connected to a touch key formed on the second external terminal, the internal terminal is connected to the body end of the first connection patterns through and the other end connected to the first external terminal to the second resistor pattern has formed on the sheet in the interior of the body is exposed to the outside of the body electrode gap a first external terminal connected to an external terminal through a second connection pattern a second electrode pattern connected with the first electrode pattern, and forming on the sheet in the interior of the body and the ground electrode gap is exposed to the outside of the body portion. A first electrode pattern and the second electrode pattern is formed is laminated on another sheet cross.
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