To provide an electronic component wherein common components can be used even if the dimensions of an installation space (thickness in particular) where the electronic component is installed are different.

An operating knob 70 to operate an electronic component body part 90 is installed freely slidably at a movable body installation part A-1 formed between a case 10 and a flexible circuit board 50. First and second abutting parts 75, 79 having different heights and abutting on the flexible circuit board 50 in accordance with separation distances L1, L2 between the case 1 and the flexible circuit board 50 are provided in the operating knob 70.