Abstract: A portable cup holder contains: multiple placing sheets, a connection shaft, and a first carry strap. A respective placing sheet includes a receiving orifice defined on a first side thereof, and the respective placing sheet includes a rotating orifice formed on a second side thereof. The connection shaft is inserted through the rotating orifice of the respective placing sheet to rotate the respective placing sheet along the connection shaft, and the connection shaft includes a hollow orifice and a partition post horizontally extending in the hollow orifice. The first carry strap is formed in a ring shape and includes an accommodation space defined inside the first carry strap, the partition post of the connection shaft is received in the accommodation space of the first carry strap so that the first carry strap is connected with the connection shaft and is pulled to the partition post upward or downward.