An upper rail is located along an upper edge of a boarding opening. A center rail extends from a side edge of the boarding opening in a direction away from the boarding opening. A lower rail is located along a lower edge of a sliding door. An upper hinge that is guided by the upper rail and a center hinge that is guided by the center rail slide with the sliding door. A lower hinge that is guided by the lower rail is located at each of front and rear side edges of the boarding opening, and does not slide. A lower edge lock mechanism fixes the lower edge of the sliding door to a vehicle body side structure.

A vehicle side structure includes: a vehicle body side structure including a boarding opening through which an occupant gets into and out of a vehicle; a sliding door configured to slide to open and close the boarding opening; an upper support structure; a middle support structure; a lower support structure; and a drive unit located in an upper portion of the vehicle body side structure and configured to drive the sliding door to open and close via at least a part of the upper support structure. The upper support structure, the middle support structure, and the lower support structure are configured to support the sliding door in upper, middle, and lower portions of the vehicle body side structure in a vertical direction of a vehicle such that the sliding door slides, respectively.

A vehicle side structure includes: a vehicle body side structure including a boarding opening through which an occupant gets into and out of a vehicle; a sliding door configured to slide to open and close the boarding opening; an upper support structure; a middle support structure; a lower support structure; and a drive unit located in an upper portion of the vehicle body side structure and configured to drive the sliding door to open and close via at least a part of the upper support structure. The upper support structure, the middle support structure, and the lower support structure are configured to support the sliding door in upper, middle, and lower portions of the vehicle body side structure in a vertical direction of a vehicle such that the sliding door slides, respectively.

A door opening and closing apparatus includes: a body defining an opening and an interior space, the opening being open toward the outside of a vehicle body and the interior space defined inside the vehicle body so as to be connected to the opening; a door configured to open and close the opening; a guide part disposed in the interior space and guiding the door such that the door moves in a first direction and a direction opposite to the first direction, the first direction being a direction from the outside of the vehicle body to the inside of the vehicle body; and a transport part disposed in the interior space and that moves the door in a second direction and a direction opposite to the second direction.

A door opening and closing apparatus includes: a body defining an opening and an interior space, the opening being open toward the outside of a vehicle body and the interior space defined inside the vehicle body so as to be connected to the opening; a door configured to open and close the opening; a guide part disposed in the interior space and guiding the door such that the door moves in a first direction and a direction opposite to the first direction, the first direction being a direction from the outside of the vehicle body to the inside of the vehicle body; and a transport part disposed in the interior space and that moves the door in a second direction and a direction opposite to the second direction.

A device for operating opposite sliding doors of a vehicle includes a center rail mounted at a center inside a door and formed in a curved shape so that the door moves to the outside of a vehicle interior of the vehicle when the door is opened. A center roller is mounted on the vehicle body so as to correspond to the center rail. The center roller is configured to move the center rail by being coupled to the center rail when the door is opened or closed as a center bearing unit formed at one side of the center roller is seated on the center rail. The center roller has a center shaft formed at a position spaced apart from the center bearing unit such that the center shaft can rotate the center roller.

A device for operating opposite sliding doors of a vehicle includes a center rail mounted at a center inside a door and formed in a curved shape so that the door moves to the outside of a vehicle interior of the vehicle when the door is opened. A center roller is mounted on the vehicle body so as to correspond to the center rail. The center roller is configured to move the center rail by being coupled to the center rail when the door is opened or closed as a center bearing unit formed at one side of the center roller is seated on the center rail. The center roller has a center shaft formed at a position spaced apart from the center bearing unit such that the center shaft can rotate the center roller.

A vehicle opening and closing body control device includes a full close control unit configured to cause first and second opening and closing bodies that are provided at an opening portion of a vehicle and execute opening and closing operations in opposite directions to execute the closing operations to a fully closed position. The full close control unit is configured to cause the second opening and closing body to execute the closing operation at an operation speed slower than that of the first opening and closing body.

A vehicular slide door apparatus includes a guide rail forming a sliding path. A cutout portion in a side wall portion of the sliding path forms an insertion opening for a guide roller. The apparatus includes a fixing portion at a first end portion in the cutout portion, a positioning portion at a second end portion in the cutout portion, a closing member that includes a fixed end fixed to the fixing portion and a free end positioned by the positioning portion and that closes the insertion opening, and a fulcrum forming portion forming a rotation fulcrum for the closing member. The fulcrum forming portion generates biasing force of displacing the free end outward. The free end is positioned in contact against the positioning portion located on an outer side of the sliding path. Thereby, the free end and the side wall portion form a continuous sliding contact surface.

A vehicular slide door apparatus includes a guide rail forming a sliding path. A cutout portion in a side wall portion of the sliding path forms an insertion opening for a guide roller. The apparatus includes a fixing portion at a first end portion in the cutout portion, a positioning portion at a second end portion in the cutout portion, a closing member that includes a fixed end fixed to the fixing portion and a free end positioned by the positioning portion and that closes the insertion opening, and a fulcrum forming portion forming a rotation fulcrum for the closing member. The fulcrum forming portion generates biasing force of displacing the free end outward. The free end is positioned in contact against the positioning portion located on an outer side of the sliding path. Thereby, the free end and the side wall portion form a continuous sliding contact surface.