A reel comprising a hub formed in the shape of a cylindrical tube with a base, on an outer peripheral surface of which a recording tape is wound; a base side flange portion that projects-out to a radial direction outer side of a base portion side of the hub; a flange member configured in a disc shape or an annular plate shape of a material with an elastic modulus at least equal to a material that constitutes the hub, the flange member being coaxially joined to an opening end portion of the hub; a metal plate formed in a circular plate shape or an annular plate shape, which is fixed coaxially to the base portion of the hub; and plate retention portions that are formed integrally with the base portion of the hub and touch an outer peripheral surface of the metal plate at at least four locations, which are at equal intervals in a circumferential direction of the hub.