To provide a bracelet link pin which has improved performance in connection/disconnection of adjacent pieces and also improved reliability in connection between adjacent pieces.

A recessed portion 21b between arm portions 21a having first through-holes 22 is disposed with a protruded portion (engagement portion) 21c having a second through-hole 23, and the bracelet link pin 31 is inserted into the first and second through-holes 22 and 23 to mutually connect adjacent pieces 21. The bracelet link pin 31 is made of an elastically deformable wire material which has a diameter smaller than those of the first and second through-holes 22 and 23. At least one of both end parts 32 of the pin 31 disposed in the first through-holes 22 and the middle part of the pin 31 disposed in the second through-hole 23 has an elastic deformation portion 33 of zigzag shape in side view. The elastic deformation portion 33 has a width larger than the diameters of first and second through-holes 22 and 23 in a free state, and makes elastic contact with one of the inside surfaces of the first and second through-holes 22 and 23 in a service state.