Even called Paper cup holder.

Directions for use:

There are three installation methods, that is double-sided adhesive magnet and screw.
Directions of double-sided adhesive: Tear the white paper on the double-sided adhesive, stick behind the paper cup holder. Then press firmly and continuously. Please keep the wall clean and free from oil stains.
Open the lid, put the plastic cup or paper cup, and gently rotate the cup downward then you can take the cup.

Paper Cup Dispenser