An ottoman device includes a first mechanism that has an operating portion operable to adjust a longitudinal position of a front end portion of a seat cushion corresponding to the inner sides of knees of a seated person, and is operable to vary a cushion length by adjusting the longitudinal position of the front end portion of the seat cushion by means of the operating portion, an ottoman body that extends from the front end portion of the seat cushion toward toes of the seated person, and a second mechanism operable to lift the ottoman body by reducing a flexion angle of the ottoman body at the front end portion of the seat cushion, so as to bring the ottoman body into a lifted condition. The ottoman body is provided as a unit with the operating portion, and the first and second mechanisms operate independently of each other.