Seat sliding device for vehicle

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

• a lower rail;
• an upper rail supported to be movable relative to the lower rail;
• and
• a pressing member attached to one of the lower rail and the upper rail via a biasing member, the pressing member always pressing the other of the lower rail and the upper rail with the use of a biasing force of the biasing member, wherein:
• the lower rail and the upper rail are extended in a first direction;
• and
• the pressing member presses the other of the lower rail and the upper rail obliquely such that component forces are generated both in the first direction and a second direction that is orthogonal to the first direction;
• the biasing member corresponds to a spiral spring;
• the pressing member corresponds to a rotational member rotated by the biasing force of the spiral spring;
• the spiral spring and the rotational member are attached to one of the lower rail and the upper rail in a state where axial centers coincide with each other;
• the lower rail is inclined in such a manner that one of a front portion and a rear portion of the lower rail is higher than the other;
• and
• the pressing member is attached to the upper rail and presses the lower rail such that a component force along a downward direction of the lower rail is generated.