Door impact beam

A door impact beam for a vehicle, the door impact beam comprising:

• a top plate facing an outer panel that constitutes a door of the vehicle and extending in the front-rear direction of the vehicle;
• a recessed bead disposed on the top plate and having a U shape toward an inner panel that constitutes the door of the vehicle;
• and
• walls protruding toward the inner panel from both ends of the top plate in a width direction of the top plate, wherein
• the door impact beam is formed by press-molding a sheet-metal composite,
• the sheet-metal composite includes a sheet-metal main body and a reinforcing sheet metal overlapping with a part of the sheet-metal main body in a longitudinal direction, and
• the door impact beam extends in a front-rear direction of the vehicle in an internal space formed by the outer panel and the inner panel, wherein the recessed bead has a shape such that a depth from an opening to a bottom surface is deepest at a substantially central part of the door impact beam in the front-rear direction of the vehicle and gradually becomes shallower toward both ends in the longitudinal direction, and wherein a maximum bead depth is set to be less than a height extension of the walls extending away from the top plate and toward the inner panel such that a cross-section of the central part of the impact beam has a hat shape.