A dial device has a dial, a base member, a sphere; and a biasing member that is provided to one of the dial and the base member and biases the sphere toward the other one. An inner peripheral surface of an accommodation hole includes a portion in which a first hemispherical portion of the sphere is interposed between a first contact point and a second contact point, the first hemispherical portion of the sphere being on one side with respect to a first plane that includes the rotation direction and a biasing direction of the biasing member and passes through a center of the sphere. A recessed surface of each of a plurality of recesses includes a portion in which a second hemispherical portion of the sphere on another side with respect to the first plane is interposed between a third contact point and a fourth contact point.