To provide a device for sending wheel information that maintains a predetermined function regardless of the time of tire change.

The device includes a control unit and a solar battery mounted on a wheel portion of a wheel, the control unit including: a wheel information detection part for detecting the wheel information related to the wheel; a wheel information memory part for storing the wheel information; a calculating part for calculating various things, on the basis of the wheel information detected; and a wheel information output part for output of the wheel information or calculation result to the outside of the wheel. The control unit further includes a power supply control part for supplying generated output of the solar battery into the control unit.