An operating lever is provided at one of a front face, an upper face, and a back face of a seat including a seat cushion and a seat back. The operating lever may include a first lever having a first end and a second end, and a second lever having a first end and a second end. The second end of the first lever and the first end of the second lever may be pivotably connected to each other, and the first end of the first lever may be pivotably connected to the seat such that the first lever is configured to change an attitude of the seat. In addition, the second end of the second lever may be formed as an operating portion, and when the operating portion is operated in a direction away from the seat, the first lever and the second lever pivot may away from the seat and the attitude of the seat is adjusted.