Operation device

1. A fader comprising:

a stationary portion;

a movable portion configured to move along an axial direction of a shaft fixed to the stationary portion; and

a load adjuster configured to adjust a movement load of the movable portion, wherein

the movable portion is provided with an elastic portion that is elastically deformable, and

the load adjuster is provided to the stationary portion and comprises an adjustment controller and a press portion, said adjustment controller comprising:

a rotational portion capable of being rotated;

a plurality of converters, each of said plurality of converters being configured to convert a rotational movement of the rotational portion into a linear movement;

wherein the adjustment controller is configured to move the press portion toward and away from the elastic portion; and,

wherein the press portion is configured to press the elastic portion in accordance with each of the linear movements in a direction orthogonal to a moving direction of the movable portion.

2. The fader according to claim 1 , wherein

the adjustment controller is exposed to an outside of a final product in which the fader is installed.

3. The fader according to claim 1 , wherein

the adjustment controller comprises: a rotation restricting portion configured to restrict a rotational angle of the rotational portion to less than 360 degrees.

4. The fader according to claim 1 , wherein

the elastic portion comprises: an elastic member provided to the movable portion; and a non-elastic member provided to the elastic member and configured to be brought into contact with the press portion.