This is Shinenawa.
It is a sacred straw rope.
New Years is the event to welcome Toshigamisama (the god of the incoming year).
People think Toshigamisama come to every house and give power to live and happiness.
Shimenawa shows the sacred places fit for the worship of Toshigamisama.
People put them in front of the entranceway to their homes.
I made this by myself for the first time in my life.