Rocking operation type electric component

1. A rocking operation type electric component comprising:

an operation knob that has a bottomed case-shaped configuration and is rockably held;

a signal generating unit that includes a movable element pressed and driven by the operation knob and generates a different electric signal in response to a position change of the movable element; and

a case on which a mounting frame for pivotally supporting the operation knob is protrusively provided formed and in which the signal generating unit is received,

wherein a pair of rotation shafts which face each other are protrusively formed on inner wall portions of the operation knob, respectively,

through-holes are respectively formed in a pair of wall portions of the mounting frame which face each other, and

the rotation shafts are fitted into the through-holes from the outside of the mounting frame to be rotatably supported by the mounting frames,

wherein two mounting frames, which are located in parallel with surfaces having the through-holes adjacent each other, and a partition wall, which is located between the two mounting frames, are protrusively formed on the case, and

at an opened end of the operation knob, a side wall facing the partition wall has a tapered portion that a front end portion gradually decreases in its thickness and a gap between the partition wall and the front end portion of the side wall of the operation knob gradually decreases.

2. The rocking operation type electric component according to claim 1 ,

wherein the signal generating unit includes a plurality of movable contacts which are driven by the movable element, and a plurality of fixed contacts to and from which the movable contacts can be connected and disconnected.