PURPOSE: To provide an electronic wrist watch capable of easy input operation even during exercising.

CONSTITUTION: To an operation auxiliary part 12 freely detachably and attachably attached to a wrist watch case 1 provided in the front with push button switches 10 and 11 with projected button parts, pushing parts 14 and 15 to be pushed for closing the push button switches 10 and 11 and function parts 16 and 20 for functioning the button parts at the moment the pushing parts 14 and 15 are pushed in operation, are provided. Thus, by attaching an operation auxiliary part 12 to the wrist watch case 1 before exercising and the like, when the pushing parts 14 and 15 of the operation auxiliary part 12 are pushed with even a palm or waist, the function parts 16 and 20 of the operation auxiliary part 12 function the button parts of the push button switches 10 and 11 pushing parts 14 and 15. Thus, easy operation becomes possible without confirming the pushing switches 10 and 11 with eyes and fingers.