A door assembly including a door outer panel, a door inner panel that is coupled to and positioned inboard of the door outer panel in a vehicle lateral direction, an door impact beam positioned between the door outer panel and the door inner panel, where the door impact beam extends in a vehicle longitudinal direction, and an engagement member coupled to the door impact beam, the engagement member including a shaft that extends through a hole defined by the door impact beam and that extends in the vehicle lateral direction toward the door inner panel.

A vehicle door beam is disclosed. The vehicle door beam includes: a beam body extending along a front-rear direction of the vehicle; and an inner side member disposed at a vehicle inner side of the beam body. The inner side member includes: a fixing part fixed to the beam body; and a non-fixing part not fixed to the beam body and being disposed at a position in front of the fixing part in the front-rear direction.

A vehicle door beam is disclosed. The vehicle door beam includes: a beam body extending along a front-rear direction of a vehicle; and a bracket joining the beam body to the vehicle door body. The bracket includes a rib formed continuously on an extension line of the bracket extending along the beam body, and the rib is continued to a position of an end of the bracket.