A door apparatus for a vehicle comprising: an actuator unit including an actuator that generates a driving force for driving a vehicle door for opening or closing an opening portion formed in a vehicle body by relatively moving to the vehicle body or for driving a driven body that is a locking device which is built in the vehicle door and is configured to hold a state where the vehicle door closes the opening portion, and an actuator housing that accommodates at least a part of the actuator; and a cable unit that, in use, connects the driven body and the actuator unit to each other, and transmits a driving force of the actuator to the driven body, wherein the cable unit includes a flexible outer tube, an annular member fixed to one end of the outer tube and including a supported portion (83, 84) which is supported to be relatively movable by a supporting portion (58, 59, 67, 68) of the actuator housing outside the outer tube, and a flexible inner cable that penetrates inside the outer tube and the annular member to be relatively movable, and has one end protruding from the annular member to outside to which the driving force of the actuator is applied and the other end which, in use, is connected to the driven body, the supporting portion (58, 59, 67, 68) includes a pair of suppressing portions (59, 68) opposed to each other while forming a gap, and the annular member includes a damper which is positioned between the supported portion (83, 84) and the actuator, and is in contact with respective opposing surfaces of the pair of suppressing portions (59, 68). an actuator unit including an actuator that generates a driving force for driving a vehicle door for opening or closing an opening portion formed in a vehicle body by relatively moving to the vehicle body or for driving a driven body that is a locking device which is built in the vehicle door and is configured to hold a state where the vehicle door closes the opening portion, and an actuator housing that accommodates at least a part of the actuator; and a cable unit that, in use, connects the driven body and the actuator unit to each other, and transmits a driving force of the actuator to the driven body, wherein the cable unit includes a flexible outer tube, an annular member fixed to one end of the outer tube and including a supported portion (83, 84) which is supported to be relatively movable by a supporting portion (58, 59, 67, 68) of the actuator housing outside the outer tube, and a flexible inner cable that penetrates inside the outer tube and the annular member to be relatively movable, and has one end protruding from the annular member to outside to which the driving force of the actuator is applied and the other end which, in use, is connected to the driven body, a flexible outer tube, an annular member fixed to one end of the outer tube and including a supported portion (83, 84) which is supported to be relatively movable by a supporting portion (58, 59, 67, 68) of the actuator housing outside the outer tube, and a flexible inner cable that penetrates inside the outer tube and the annular member to be relatively movable, and has one end protruding from the annular member to outside to which the driving force of the actuator is applied and the other end which, in use, is connected to the driven body, the supporting portion (58, 59, 67, 68) includes a pair of suppressing portions (59, 68) opposed to each other while forming a gap, and the annular member includes a damper which is positioned between the supported portion (83, 84) and the actuator, and is in contact with respective opposing surfaces of the pair of suppressing portions (59, 68).