A lever switch has a housing with an opening, a slider slidably accommodated in the housing, and a lever engaged with the slider for causing sliding of the slider and projecting from the housing via the opening. A cover is mounted to the housing to cover the opening. A knob is mounted to and surrounds the lever and has a base end portion that faces the cover and through which the lever extends. One of the cover and the base end portion of the knob is convex, and the other is concave so that the cover and base end portion of the knob have generally mutually complementary shapes facing each other.