To make a wrist watch band extensible and improve fitting feeling by connecting pieces with connecting parts by connecting members and placing an elastic member with compressibility in between a connection member and a piece.

A piece 10 made of a metal or hard resin is equipped with a protruding part 11 on one end in the longitudinal direction of this wrist watch band and a dent part 12 on the other end as connection parts. A long hole 13 of long round shape in the width direction is formed on the protruding part 11 and round holes 14 are formed on a pair of protruding part on the dent part 12. A cylindrical elastic member 15 made of elastic material is engaged with the inside of the outside end part of the long hole 13 and a C-shape split pipe 16 is fit into the inside of the elastic member 15. A pin 17 is inserted as a connection member through the split pipe 15 from one round hole 14 and the tip end of the pin 17 is inserted into the other round hole 14a to connect both pieces 10. Thus band fitting feeling is improved without tightening an wrist.