PURPOSE: To prevent defective contactness of contacts and protect function of movable portion from damage in an electronic apparatus having the silicone rubber cramming structure by coating slide contact part and movable part with grease before cramming of packings.

CONSTITUTION: Variable resistors 20 are provided on a printed wiring board 5 and the slide contact part is exposed. The exposed area of the variable resistors 20 is covered with silicone grease 21. With cramming of silicon rubber, the variable resistors 20 are covered with silicone grease 31 at the surrounding and the external side thereof is also crammed with silicone rubber. The silicone grease 21 has the fluidity and if distortion is generated depending on thermal expansion difference between silicone rubber and circuit board due to temperature change, the silicone grease 21 absorbs such distortion and does not give any influence of distortion to the slide contact area of the variable resistor 20. The similar processings are conducted for various contacts and movable areas.