A steering device has a guide rail and a holding rubber. The guide rail is mounted on a mounting stay of a vehicle by way of an upper bracket, and the holding rubber restricts movement of the guide rail relative to the upper bracket. The guide rail has a fixed portion and a main body portion extending forward of the vehicle along the axial direction of a steering shaft from the fixed portion. The main body portion is inserted into a through hole of a vehicle body bracket. The holding rubber has a positioning protrusion and a detent pawl for restricting movement of the guide rail relative to the upper bracket before being fixed to the mounting stay so as to hold them at a mounting position. The detent pawl is formed so as to reduce a restricting force for restricting movement of the guide rail relative to the upper bracket as the guide rail comes closer to the mounting stay by screwing a nut onto a bolt.