PURPOSE: To prevent the damage of wiring itself and the joining portion of the wiring on the board by allowing no direct transmission of shock to the board even if the strong shock is applied to a pad.

CONSTITUTION: A through hole 4 and a spherical surface-like dome portion 4b are formed in a top side case 4, a key portion 5a and contact push portion 5b, constituting a pad 5, are mutually connected through the through hole 4a, the key portion 5a is sliding touched to the outer surface of the dome portion 4b, and the contact push portion 5b is sliding touched to the inner surface of the dome portion 4b. When the protrusion 7a of the pad 5 in correspondence to an electric contact 2a on a wiring board 2 is pushed, the pad 5 is tilted as sliding touching the dome portion 4b, and the conduction portion 3a of a conduction elastic member 3 is pushed by the contact push portion 5b of the pad 5 so that the electric contact portion 2a is brought into conduction by the conduction portion 3a.