A switch device includes an operation knob on which a sliding operation can be performed in a horizontal direction, a holder member that holds the operation knob and moves in the horizontal direction, a drive member that tilts as the holder member moves in the horizontal direction, a switch that is pressed down by the drive member as the drive member tilts, and a support member that supports the holder member such that the holder member can move in the horizontal direction. The holder member has a base at a center in the horizontal direction and a flange extending outward from the base in the horizontal direction. The support member has an upper wall that restricts a movement of the holder member in a vertical direction by contacting an upper surface of the flange, and a slit between the upper wall and a middle wall lower than the upper wall.

The invention relates to a user input unit comprising a housing configured to be attached to a base of a user input device, such as a keyboard. The input unit also has a first movable element coupled to the housing, the first movable element being movable along a first direction and user operable second movable element coupled to the housing, the second movable element being movable along a second direction, the second direction being different from the first direction. Further a transmission configured to transfer movement of the second movable element along the second direction into movement of the first movable element along the first direction is provided. The invention also relates to a user input device, such as a keyboard, comprising a base, such a user input unit, and a sensor configured to sense a movement or a position of the first movable element along the first direction.