The present invention provides a top knot cap (headgear provided with a ponytail) comprising the upper top knot portion (22) formed by extending the top knot portion (20) connected to the crown (10) and the said upper top knot portion (22) may be bundled with the binding cord (31) to form a ponytail or unfurled to cover the neck. The top knot cap may be provided with the meeting and parting portion (23) that splits apart when the said top knot portion (20) is unfurled. The inventive top knot cap may protect the head part of a user and further express various designs full of ornamental effects.