A cup holder may include a holder body having a holding groove opened at an upper portion thereof, and provided such that a container is inserted into the holding groove, a guide integrally or monolithically formed in the holder body with an elastic adjustment body interposed therebetween, so as to protrude inward from the holding groove, the guide tightly supporting a side of the container in a state in which the guide protrudes inward from the holding groove, and the elastic adjustment body integrally or monolithically formed in the guide and the holder body so as to provide an elastic restoring force in order for the guide to elastically protrude.