The operator includes: an operation body having a shaft section that extends along a first direction (Z direction), the operation body being operated by a user; a first detecting body to detect the rotational motion of the operation body about a rotational axis that extends along a plane, the plane being defined by second (X direction) and third (Y direction) directions, the second direction being orthogonal to the first direction, and the third direction being orthogonal to the first and second directions; and a second detecting body provided independently of the first detecting body to detect the translational motion of the operation body along the plane described above.