PURPOSE: To improve the push feeling of a rubber contact by forming tapered protrusions at the head of a supporting wall which is formed in a dome shape to allow the elastic transformation of the rubber contact.

CONSTITUTION: Fig. (A) shows a rubber contact 3a is in a non-push condition. When the rubber contact 3a is pushed in such a condition via a stem 6, protrusions 11 are open outward during a stroke S4 as shown in Fig. (B). When it is further pushed during a stroke S1, the supporting wall 8 is curved and reversed at a peak point (a) as shown in Fig. (C) to reduce pushing force F over a stroke S2 since then, put a moving contact 4 in contact with a fixed contacts 2 at (bb) points and turn a switch on. After the switch is on, the pushing force F is sharply increased again through a minute overstroke S5 due to the protrusions 11. As a result, a stroke from the beginning point of the pushing force F to the peak point (a) is the sum of the stroke S4 during the enlargement of the protrusions 11 and the stroke S1 during the curving of the supporting wall 8 to allow the delay of the timing from the beginning point of the pushing force F to the peak point (a).