PURPOSE: To combine easily a winding core and its holder, by boring two sets of small-holes which are positioned around the hole being bored through the winding core and around the projection protruding out of the winding core holder respectively and which oppose each other, and by embedding magnets in the two sets of small-holes respectively, to secure together the winding core and the holder, when a coil winding head is constructed by inserting the projection into the hole.

CONSTITUTION: A hole 2 is bored through the end face of a winding core 1 and a head cap 7 is fitted around the end face. The projection 5 protruding out of a winding core holder 4 is then inserted in the hole 2 to integrate the winding core 1 and the holder 4 to construct a coil winding head. Two sets of small-holes which oppose each other, are bored through the circumferential portions around the hole 2 and the projection 5 respectively which are not being covered by the cap 7, and magnets 3 and magnets 6 are embedded in the two sets of small-holes respectively. In this way, magnets 3 and magnets 6 attract each other to integrate the winding core 1 with the holder 4. Accordingly, the winding core 1 and the holder 4 can be combined simply, and the holder 4 can be easily taken out and in the winding core 1.