To prevent a wire from being easily pulled and removed from a base member by properly improving the fixing strength of the wire against the base member of a threader, especially fixing strength against stretching force by a simple means.

The threader is provided with the wire 2 forming a hollow frame part 20 for guiding a thread and linear stretched parts 21 and 21 stretched outward from the base tip part 20b of the part 20, and the base member 1 provided with an insert-holding part 3 inserting and supporting the parts 21 and 21 of this wire 2. The parts 21 and 21 of this wire 2 are provided with curved parts 22 and 22 obtained by bending or curving these parts 21 and 21 and these parts 22 and 22 are restrained by the part 3 of the member 1.