A crimping die including a fixed die and a moving die which moves away from or toward the fixed die, and a thread guide arranged closely to the edge of the stop hole formed in the proximal end face of an eyeless needle held by the crimping die and having a surface for guiding the suture thread to the stop hole. The thread guide is arranged such that an external force does not act on the suture thread on the outside of the stop hole formed in the eyeless needle as a crimping operation progresses when the proximal end face of the eyeless needle is crimped by the crimping die, or arranged to move in the direction in which an external force does not act.
