Vehicle door apparatus

A vehicle door apparatus comprising:

• first and second link arms each having a first pivot coupling point with respect to a vehicle body and a second pivot coupling point with respect to a door of a vehicle;
• and
• a coupling length variable mechanism provided on at least one of the first and second link arms and is configured such that a coupling length serving as a distance between the first and second pivot coupling points is variable,
• wherein
• the first and second link arms form a link mechanism configured to cause the door to perform opening and closing motions along a specified opening and closing motion track, and
• the coupling length variable mechanism is configured to operate to change the opening and closing motion track between an arc-shaped track and a linear-shaped track.