A switch device comprising: a movable body that is configured to be displaced in an axial direction in conjunction with an operation of an operated portion; a magnet provided on the movable body; and a plurality of magnetic force sensors (7; 7A, 7B, 7C) arranged facing the magnet, wherein each magnetic force sensor of the plurality of magnetic force sensors (7; 7A, 7B, 7C) includes a predetermined detection surface for detecting a magnetic force, wherein one of the plurality of magnetic force sensors (7A, 7C) is disposed with the predetermined detection surface facing the magnet and one of the plurality of magnetic force sensors is disposed with the predetermined detection surface facing away from the magnet, and the total number of the plurality of magnetic force sensors (7; 7A, 7B, 7C) is at least three, the movable body having the magnet attached to a portion facing the magnetic force sensors (7; 7A, 7B, 7C), the magnet having a width in a first direction orthogonal to the axial direction as viewed from the axial direction, and the plurality of magnetic force sensors (7; 7A, 7B, 7C) being provided to be aligned in the axial direction, and arranged in the first direction with the same distance (d) from a surface of the magnet, characterized in that, the magnet is provided in a magnetic pole orientation in which one side in the axial direction is an N pole and the other side is an S pole, and positions of the plurality of magnetic force sensors (7; 7A, 7B, 7C) in the axial direction are such that the plurality of magnetic force sensors (7; 7A, 7B, 7C) are provided to face one of magnetic poles of the magnet when the operated portion is not operated, and the plurality of magnetic force sensors (7; 7A, 7B, 7C) are provided to face the other of the magnetic poles of the magnet when the operated portion is operated. a movable body that is configured to be displaced in an axial direction in conjunction with an operation of an operated portion; a magnet provided on the movable body; and a plurality of magnetic force sensors (7; 7A, 7B, 7C) arranged facing the magnet, wherein each magnetic force sensor of the plurality of magnetic force sensors (7; 7A, 7B, 7C) includes a predetermined detection surface for detecting a magnetic force, wherein one of the plurality of magnetic force sensors (7A, 7C) is disposed with the predetermined detection surface facing the magnet and one of the plurality of magnetic force sensors is disposed with the predetermined detection surface facing away from the magnet, and the total number of the plurality of magnetic force sensors (7; 7A, 7B, 7C) is at least three, the movable body having the magnet attached to a portion facing the magnetic force sensors (7; 7A, 7B, 7C), the magnet having a width in a first direction orthogonal to the axial direction as viewed from the axial direction, and the plurality of magnetic force sensors (7; 7A, 7B, 7C) being provided to be aligned in the axial direction, and arranged in the first direction with the same distance (d) from a surface of the magnet, characterized in that, the magnet is provided in a magnetic pole orientation in which one side in the axial direction is an N pole and the other side is an S pole, and positions of the plurality of magnetic force sensors (7; 7A, 7B, 7C) in the axial direction are such that the plurality of magnetic force sensors (7; 7A, 7B, 7C) are provided to face one of magnetic poles of the magnet when the operated portion is not operated, and the plurality of magnetic force sensors (7; 7A, 7B, 7C) are provided to face the other of the magnetic poles of the magnet when the operated portion is operated.