A lever switch comprising: a base member; a first switch knob member rotatably provided with respect to the base member; a first moderation mechanism including a first elastic member and a first actuator and applying a clicking sensation accompanying the rotational operation of the first switch knob member; a substrate having a first contact member on one surface thereof; and a first slider rotating integrally with the first switch knob member and coming into contact with and separating from the first contact member, wherein the base member includes a first supporting surface formed along an outer peripheral surface of a column centered on a rotational axis of the first switch knob member and a second supporting surface formed as a curved surface having a larger diameter than the first supporting surface on one side of the column across the rotational axis, wherein a dead space is formed on the side opposite to the side where the second supporting surface is provided across the rotational axis by forming the second supporting surface only on one side across the rotational axis of the first switch knob member, wherein the first moderation mechanism is supported in a state where the first actuator is biased by the first elastic member and protrudes from the second supporting surface, wherein the first switch knob member includes a first supported surface having almost the same diameter as the first supporting surface and a second supported surface having almost the same diameter as the second supporting surface, and the second supported surface is provided with a first cam portion formed with irregularities, wherein the first supported surface is rotatably supported on the first supporting surface, and the second supported surface is rotatably supported on the second supporting surface, and wherein the first slider is held so as to be capable of coming into contact with and separating from the first contact member of the substrate on the side where the dead space is formed, being the side opposite to a side where the second supporting surface is provided across the rotational axis. a base member; a first switch knob member rotatably provided with respect to the base member; a first moderation mechanism including a first elastic member and a first actuator and applying a clicking sensation accompanying the rotational operation of the first switch knob member; a substrate having a first contact member on one surface thereof; and a first slider rotating integrally with the first switch knob member and coming into contact with and separating from the first contact member, wherein the base member includes a first supporting surface formed along an outer peripheral surface of a column centered on a rotational axis of the first switch knob member and a second supporting surface formed as a curved surface having a larger diameter than the first supporting surface on one side of the column across the rotational axis, wherein a dead space is formed on the side opposite to the side where the second supporting surface is provided across the rotational axis by forming the second supporting surface only on one side across the rotational axis of the first switch knob member, wherein the first moderation mechanism is supported in a state where the first actuator is biased by the first elastic member and protrudes from the second supporting surface, wherein the first switch knob member includes a first supported surface having almost the same diameter as the first supporting surface and a second supported surface having almost the same diameter as the second supporting surface, and the second supported surface is provided with a first cam portion formed with irregularities, wherein the first supported surface is rotatably supported on the first supporting surface, and the second supported surface is rotatably supported on the second supporting surface, and wherein the first slider is held so as to be capable of coming into contact with and separating from the first contact member of the substrate on the side where the dead space is formed, being the side opposite to a side where the second supporting surface is provided across the rotational axis.