A vehicle door comprising: an inside handle; and a power child lock device comprising: a rotation driving mechanism; a switch link connected to the rotation driving mechanism so as to be movable vertically by a rotational force of the rotation driving mechanism; an inside handle lever cooperatively connected to the inside handle installed in the vehicle door; a release lever connected to a door catch and configured to lock or release the door catch; and a power child lever configured to selectively connect or separate the inside handle lever and the release lever by being moved by the switch link, wherein the rotation driving mechanism is a drive motor capable of rotating clockwise and counterclockwise, wherein: the drive motor has a worm integrally rotated therewith; the switch link has a cylindrical worm wheel gear meshing with the worm; the switch link has a link body extending vertically; one side of the link body is provided with the cylindrical worm wheel gear that protrudes from the link body; and a lower end of the link body is provided with a pressing flange configured to press the power child lever and protruding in a direction opposite to the cylindrical worm wheel gear. an inside handle; and a power child lock device comprising: a rotation driving mechanism; a switch link connected to the rotation driving mechanism so as to be movable vertically by a rotational force of the rotation driving mechanism; an inside handle lever cooperatively connected to the inside handle installed in the vehicle door; a release lever connected to a door catch and configured to lock or release the door catch; and a power child lever configured to selectively connect or separate the inside handle lever and the release lever by being moved by the switch link, wherein the rotation driving mechanism is a drive motor capable of rotating clockwise and counterclockwise, wherein: the drive motor has a worm integrally rotated therewith; the switch link has a cylindrical worm wheel gear meshing with the worm; the switch link has a link body extending vertically; one side of the link body is provided with the cylindrical worm wheel gear that protrudes from the link body; and a lower end of the link body is provided with a pressing flange configured to press the power child lever and protruding in a direction opposite to the cylindrical worm wheel gear. a rotation driving mechanism; a switch link connected to the rotation driving mechanism so as to be movable vertically by a rotational force of the rotation driving mechanism; an inside handle lever cooperatively connected to the inside handle installed in the vehicle door; a release lever connected to a door catch and configured to lock or release the door catch; and a power child lever configured to selectively connect or separate the inside handle lever and the release lever by being moved by the switch link, wherein the rotation driving mechanism is a drive motor capable of rotating clockwise and counterclockwise, wherein: the drive motor has a worm integrally rotated therewith; the switch link has a cylindrical worm wheel gear meshing with the worm; the switch link has a link body extending vertically; one side of the link body is provided with the cylindrical worm wheel gear that protrudes from the link body; and a lower end of the link body is provided with a pressing flange configured to press the power child lever and protruding in a direction opposite to the cylindrical worm wheel gear. the drive motor has a worm integrally rotated therewith; the switch link has a cylindrical worm wheel gear meshing with the worm; the switch link has a link body extending vertically; one side of the link body is provided with the cylindrical worm wheel gear that protrudes from the link body; and a lower end of the link body is provided with a pressing flange configured to press the power child lever and protruding in a direction opposite to the cylindrical worm wheel gear.