An operation device includes a detecting portion that is configured to detect an operation by a detected object and includes a plurality of operational areas each having a different assigned function executable on a controlled device as an operational object; and a dividing portion to guide the operation of the detected object and to separate the plurality of operational areas along boundaries between the plurality of operational areas of the detecting portion. The dividing portion includes an operable area that allows an operation across adjacent ones of the operational areas by the detected object.