There are provided a vehicle-body frame member forming an opening portion for entrance at a vehicle side part and a front side door provided so as to open and close the opening portion. The vehicle-body frame member comprises a side sill, the front side door comprises a door panel portion provided with an inner lower portion which overlaps with the side sill in a vehicle wide view and reinforcement portions provided at three side-portions of a peripheral part of the door panel portion which are continuous and include the inner lower portion such that the reinforcement portions overlap with the vehicle-body frame member in a vehicle side view.

A side door comprises a door panel portion and a reinforcement portion (a lower-side reinforcement portion and others). The door panel portion is provided to cover an opening portion for entrance and configured such that its peripheral part overlaps with an opening-portion-forming vehicle-body frame member (a side sill and others) in a vehicle side view. The reinforcement portion is provided at the peripheral part of the door panel portion such that it overlaps with the opening-portion-forming vehicle-body frame member in the vehicle side view, thereby reinforcing the peripheral part of the door panel portion against a collision load applied to the side door from a vehicle side. The reinforcement portion is provided at a portion of the peripheral part of the door panel portion which includes a part corresponding to the vehicle-width-direction-extending vehicle-body frame member (a first floor cross member and others).

There are provided a vehicle-body frame member forming an opening portion for entrance at a vehicle side part and a front side door provided so as to open and close the opening portion. The vehicle-body frame member comprises a side sill, the front side door comprises a door panel portion provided with an inner lower portion which overlaps with the side sill in a vehicle wide view and reinforcement portions provided at two side-portions of a peripheral part of the door panel portion which are continuous and include the inner lower portion such that the reinforcement portions overlap with the vehicle-body frame member in a vehicle side view.

A vehicle door structure includes an inner panel, an outer panel, a guard beam and a reinforcing member. The guard beam extends laterally in a cavity between the inner and outer panels. The reinforcing member disposed in the cavity and being positioned on a floor of the vehicle door structure below the guard beam.

A vehicle door for use in a vehicle body comprising a rocker (20) is described. The vehicle door comprises an inner door panel (11) and an outer door panel (13), wherein the door further comprises a reinforcement element (12) arranged in a lower portion of the door such that when the door is mounted in the vehicle body, the reinforcement element (12) is at the height of the rocker (20) and such that when a side impact is received by the door the reinforcement element with the inner door panel is supported by the vehicle rocker. The reinforcement element (12) is a U-shaped bracket that extends from the inner door panel (11) to the outer door panel (13), the U-shaped bracket (12) being arranged with an open side facing the inner panel. The disclosure further relates to a vehicle having a vehicle body that comprises a rocker and such a door.

A side vehicle-body structure of a vehicle includes a rear door having a center pillar extending in a vehicle up-down direction built in a front portion of the rear door, and a front door having a door impact bar extending in a vehicle front-rear direction built in the front door. A rear end of the door impact bar is disposed to overlap with the center pillar in a vehicle side view, a reinforcement gusset that connects a lower portion of the front door and a rear portion of the door impact bar to each other is included in an inner portion of the front door, and a side sill extending in the vehicle front-rear direction is adjacently disposed below a connecting portion of a lower portion of the front door at which the lower portion of the front door is connected to the reinforcement gusset.

A rigidity reinforcing structure for B-pillarless opposite sliding doors may include a column impact beam which is vertically mounted at one side of the door to support the door in an up-down direction of a vehicle; a center rail which is horizontally mounted at a center portion of the door to support the door in a front-rear direction of the vehicle and allows the door to slide; and a lower impact beam which is horizontally mounted at a lower side of the door to support the door in the front-rear rear direction and has one end portion where an intersection portion between the lower impact beam and the column impact beam is formed.

A vehicle door structure that can displace inward a region directly above a lower end of a door built-in center pillar while preventing displacement of a door lower surface to absorb lateral collision energy immediately after lateral collision is provided. In the vehicle door structure including a door built-in center pillar extending from an upper end to a lower end at a front end in a rear door of a biparting door system, a reinforcement is provided on a door lower surface below the door built-in center pillar, a part of the lower end of the door built-in center pillar is mounted to the reinforcement, and a low rigidity portion having lower rigidity than an upper part the door built-in center pillar is provided directly above the lower end of the door built-in center pillar.

A vehicle-body structure of a vehicle comprises a front side door provided so as to open and close an opening portion for entrance which is formed by a vehicle-body frame member. The front side door comprises a door panel portion and reinforcement portions provided at a peripheral part of the door panel portion such that at least part of the reinforcement portions overlaps with the vehicle-body frame member in a vehicle side view, the reinforcement portions being configured to reinforce the door panel portion such that when a collision load is inputted to the front side door in a vehicle side collision, a connection state of the door panel portion and the vehicle-body frame member is maintained.

There are provided a vehicle-body frame member forming an opening portion for entrance at a vehicle side part and a front side door provided so as to open and close the opening portion. The vehicle-body frame member comprises a side sill, the front side door comprises a door panel portion provided with an inner lower portion which overlaps with the side sill in a vehicle wide view and reinforcement portions provided at three side-portions of a peripheral part of the door panel portion which are continuous and include the inner lower portion such that the reinforcement portions overlap with the vehicle-body frame member in a vehicle side view.