A window regulator for a vehicle includes first, second, third, fourth belt guiding members, a loop belt member including a plurality of teeth at a first surface and installed on the belt guiding members with exhibiting an eight-shape, and a rotational member engaged with the belt member and driven by a motor. The belt member includes first and second moving portions, which are arranged in parallel with each other, and third and fourth moving portions, which are arranged to intersect each other. First and second supporting members are connected to the belt member at the first and second moving portions, respectively. First and second twisted portions are provided at the belt member at the third and fourth moving portions, respectively, by twisting the belt member for reversing first and second surfaces of the belt member. Accordingly, the teeth of the belt member contact all of the belt guiding members.