A seat sliding device for a vehicle includes a first rail, which is adapted to be fixed to one of a vehicle floor and a seat and a second rail, which is adapted to be fixed to the other one of the vehicle floor and the seat and coupled to the first rail to make relative movement with respect to the first rail. An urging member is provided with a latch part, which is latched to a second coupling wall part and a latch end part, which is latched to a lock lever. The urging member generates in association with bending deformation an urging force which urges the lock lever in a vertical direction toward a direction in which the lock lever engages with the first rail. The urging member has a coil part wound about a rotating shaft between the latch part and the latch end part.