A switch device comprising: a knob that is rotatable around a first shaft; a cam (9A, B) that is rotatable around a second shaft from a reference position in a predetermined direction determined by a rotational direction of the knob by engaging with an operation element (73A,B) extending from the knob; a first switch element that, when the cam (9A,B) is rotated in one direction around the second shaft, is switched on by a first pressing portion at one side of the cam (9A, B) engaging an actuation portion of the switch element; and a second switch element that, when the cam is rotated in the other direction around the second shaft, is switched on by a second pressing portion at the other side of the cam engaging an actuation portion of the switch element; wherein as viewed in a shaft direction of the second shaft of the cam (9A,B):(a), the first and second switch elements (23, 24), and (b) the first and second pressing portions (92a,b) are respectively arranged to be symmetrical around the second shaft; wherein the knob is provided with an operation portion, to which force is applied in use, said operation portion being at one side of the knob in the longitudinal direction, the operation portion being operated to effect rotation of the knob, and the first shaft of the knob is set closer to the other side in the longitudinal direction, wherein an engagement portion of the operation element (73A,B) is, as viewed in an axial direction of the first shaft of the knob, engaged to an engagement groove of the cam (9A,B) on a straight line (Lm) connecting the first shaft of the knob and the second shaft of the cam (9A,B), and wherein the second shaft is set in parallel to the first shaft, characterized in that the second shaft is set in a position offset to a side of the operation portion from the first shaft in the longitudinal direction of the knob. a knob that is rotatable around a first shaft; a cam (9A, B) that is rotatable around a second shaft from a reference position in a predetermined direction determined by a rotational direction of the knob by engaging with an operation element (73A,B) extending from the knob; a first switch element that, when the cam (9A,B) is rotated in one direction around the second shaft, is switched on by a first pressing portion at one side of the cam (9A, B) engaging an actuation portion of the switch element; and a second switch element that, when the cam is rotated in the other direction around the second shaft, is switched on by a second pressing portion at the other side of the cam engaging an actuation portion of the switch element; as viewed in a shaft direction of the second shaft of the cam (9A,B):(a), the first and second switch elements (23, 24), and (b) the first and second pressing portions (92a,b) are respectively arranged to be symmetrical around the second shaft; the knob is provided with an operation portion, to which force is applied in use, said operation portion being at one side of the knob in the longitudinal direction, the operation portion being operated to effect rotation of the knob, and the first shaft of the knob is set closer to the other side in the longitudinal direction, wherein an engagement portion of the operation element (73A,B) is, as viewed in an axial direction of the first shaft of the knob, engaged to an engagement groove of the cam (9A,B) on a straight line (Lm) connecting the first shaft of the knob and the second shaft of the cam (9A,B), and wherein the second shaft is set in parallel to the first shaft,