A mobile device and computer device stand used for a mobile device/computer device includes a second platy body, a first platy body, and a support piece. One end of the first platy body is connected to one end of the second platy body. The middle portion of the first platy body is formed with a hole. A support portion is disposed on the first platy body. The support portion is located at one end of the first platy body opposite to the end connected to the second platy body. The support piece is disposed in the hole. The support piece has a fold line. The support piece is divided into a first portion and a second portion by the fold line. The second portion is connected to the support portion.