Vehicle door device

A vehicle door device comprising:

• first and second link arms each having a first rotary coupling point with respect to a vehicle body and a second rotary coupling point with respect to a door of a vehicle;
• and
• a drive device configured to cause the door to perform opening and closing operations by rotating a drive link that is at least one of the first and second link arms, around a coupling axis passing through the first rotary coupling point, wherein
• the drive device includes:
• an actuator configured to output a driving torque;
• and
• a transmission mechanism configured to transmit the driving torque to the drive link,
• the transmission mechanism includes:
• an engagement portion provided to the drive link;
• a support shaft;
• and
• a drive member supported rotatably around the support shaft, and having an engagement coupling portion with respect to the engagement portion and a transmission gear portion centered on the support shaft;
• and
• a torque input gear configured to be input with the driving torque in a state of being meshed with the transmission gear portion, and
• the transmission mechanism has a configuration in which, in an axial direction of the coupling axis, a position at which the engagement coupling portion is engaged with the engagement portion is disposed at a position same as a position at which the torque input gear is meshed with the transmission gear portion.