To provide a wristwatch belt which is easily adjusted in length, gives a user excellent feeling, is easily put on and off, and has a simple structure and high design characteristics.

The wristwatch belt is structured with: a base part for placing thereon a watch body; an upper belt part of a belt structured with wavy bent shapes continued toward the end direction from the base part, having a plurality of projections formed on positions corresponding to the wavy bending points near the end; and a lower belt part of a belt structured with wavy bent shapes continued toward the end direction opposite to the upper belt from the base part, having a plurality of holes in a size allowing the projections to fit in at positions corresponding to the wavy bending points near the end on the opposite side.