Vehicle door device

The present invention suppresses swinging of a door supported by a link mechanism. A vehicle door device (30) is provided with: a first connection arm having a first rotational connection point (X1) with respect to a vehicle body (2) and a second rotational connection point (X2) with respect to a front door (31) of a vehicle (1); and a second connection arm. Furthermore, in the vehicle door device (30), the front door (31) is opened and closed on the basis of the operation of a first link mechanism (51) formed by the first link arm and the second link arm. The vehicle door device (30) is provided with a biasing force application device (151) that applies a biasing force (F) to the front door (31) in a direction that suppresses a rotational moment about the second rotational connection point (X2), said rotational moment being generated in the front door (31) as a result of inertia generated in accordance with the operation of the first link mechanism (51). 抑制支承于连杆机构的门的摆动。车辆用门装置(30)具备第一连结臂和第二连结臂，该第一连结臂具有相对于车身(2