A beverage container holding device includes a housing member for housing a beverage container, a movable floor attached to the housing member for supporting a beverage container bottom, a movable floor biasing member for upwardly biasing the movable floor, and a movable floor locking mechanism for securing the movable floor at a predetermined height against the movable floor biasing member. The housing member has a guide groove, and the movable floor has a branch portion extending through the guide groove to an outside of the housing member, and a claw portion extending horizontally from the branch portion. The movable floor locking mechanism includes an annular member which is rotatably mounted below a bottom member, at least one column member extending upward from the annular member in parallel to the guide groove, and a lock piece integrally formed on each column member for suppressing an upper surface of the claw portion.