Sliding door device for vehicle

A sliding door apparatus for a vehicle, the sliding door apparatus comprising:

• a door configured to open or close a door opening portion formed in a vehicle body;
• a door arm including a first end portion rotatably connected to an end portion of the door, and a second end portion configured to be movable along a side sill of the vehicle body;
• a lower slider coupled to the second end portion of the door arm and configured to be rectilinearly movable along the side sill of the vehicle body;
• a lower arm plate connecting the second end portion of the door arm and the lower slider and configured to perform a rotation and a rectilinear movement when the lower slider moves along the side sill;
• a door power connection portion electrically connected to the lower arm plate, extending through the door arm, and configured to transmit power required for the door;
• a power plate provided in a movement route for the lower arm plate of the side sill and electrically connected to the door power connection portion;
• and
• a vehicle power connection portion electrically connected to the power plate and configured to transmit power, which is required for the door, to the door power connection portion through the power plate.