To make a watchband for wrist watch able to be easily assembled, using structurally simple parts so that side pieces support center pieces securely from both sides, to make the watchband able to be easily disassembled when its length needs to be adjusted, and assemble the watchband to look nice.

Side pieces 3a, 3b are fastened by securing each end of connecting pins 2a, 2b, protruding outward from penetrating holes 10a, 10b, 11a, 11b on center pieces 1a, 1b, to holes 30a, 30b, 31a, 31b to stop. The rims of the heads of screws 5a, 5b to be screwed into screw holes 40e, 41e of stoppers 4a, 4b are brought into contact with the rims of holes on the side pieces 3a, 3b. The stoppers 4a, 4b are screwed from counter sunk holes 30c, 31c by the screws 5a, 5b and held until dented grooves 20a, 21a, 20b, 21b found on the connecting pins 2a, 2b are joined with projecting edges 40c, 40d, 41c, 41d.