To provide a spool winding form having a cross multilayer winding where a winding wound in crossed multilayer on a spool does not cause a loosed winding under vibration and impact, and is effectively prevented from the loosed winding without breaking and a spool case.

In a winding form having a cross multilayer winding part 5 including a part winding part 6 and an upper layer part 7, the main winding part 6 is the main body part formed in a cross multilayer winding so as to facilitate undoing in the case of undoing the winding and to prevent the occurrence of a disconnection. The upper layer part 7 is wound in a winding form different from the main winding part 6 so as to prevent a loosed winding in the upper layer of the main winding part 6 formed in the cross multilayer winding. The winding end 7a of the upper part 7 is a position where winding up more than 70% is carried out in a width direction of the top layer of the upper layer part 7, and the end of an extra fine wire is hanged from the winding end 7a to a flange part 3 of the spool 1 and tape-fastened 8.