Ajog controller comprising: a rotary operator; and a base supporting the rotary operator so that the rotary operator is rotatable, the base comprising: a braking unit configured to cause a braking force to act on the rotary operator; and an adjuster configured to adjust the braking force caused by the braking unit, the braking unit comprising: a movable body configured to be moved by the adjuster in directions toward and away from the rotary operator; and a plurality of contact members provided on the movable body, the plurality of contact members being configured to be moved with the movable body in the direction toward the rotary operator to be brought into contact with the rotary operator to cause the braking force to act on the rotary operator, wherein the plurality of contact members comprise a first contact member and a second contact member (837B, 837C), in a direction directed from the movable body toward the rotary operator, a dimension from the movable body of the first contact member is different from a dimension from the movable body of the second contact member (837B, 837C), and the braking force changes by bringing each of the first contact member and the second contact member (837B, 837C) into contact with the rotary operator with a time difference according to a movement amount of the movable body by the adjuster. a rotary operator; and a base supporting the rotary operator so that the rotary operator is rotatable, the base comprising: a braking unit configured to cause a braking force to act on the rotary operator; and an adjuster configured to adjust the braking force caused by the braking unit, the braking unit comprising: a movable body configured to be moved by the adjuster in directions toward and away from the rotary operator; and a plurality of contact members provided on the movable body, the plurality of contact members being configured to be moved with the movable body in the direction toward the rotary operator to be brought into contact with the rotary operator to cause the braking force to act on the rotary operator, wherein the plurality of contact members comprise a first contact member and a second contact member (837B, 837C), in a direction directed from the movable body toward the rotary operator, a dimension from the movable body of the first contact member is different from a dimension from the movable body of the second contact member (837B, 837C), and the braking force changes by bringing each of the first contact member and the second contact member (837B, 837C) into contact with the rotary operator with a time difference according to a movement amount of the movable body by the adjuster. a braking unit configured to cause a braking force to act on the rotary operator; and an adjuster configured to adjust the braking force caused by the braking unit, the braking unit comprising: a movable body configured to be moved by the adjuster in directions toward and away from the rotary operator; and a plurality of contact members provided on the movable body, the plurality of contact members being configured to be moved with the movable body in the direction toward the rotary operator to be brought into contact with the rotary operator to cause the braking force to act on the rotary operator, wherein a movable body configured to be moved by the adjuster in directions toward and away from the rotary operator; and a plurality of contact members provided on the movable body, the plurality of contact members being configured to be moved with the movable body in the direction toward the rotary operator to be brought into contact with the rotary operator to cause the braking force to act on the rotary operator, wherein the plurality of contact members comprise a first contact member and a second contact member (837B, 837C), in a direction directed from the movable body toward the rotary operator, a dimension from the movable body of the first contact member is different from a dimension from the movable body of the second contact member (837B, 837C), and the braking force changes by bringing each of the first contact member and the second contact member (837B, 837C) into contact with the rotary operator with a time difference according to a movement amount of the movable body by the adjuster.