Foot pad and backrest seat can be linked

Object of the present invention is to provide an electric device even when not equipped, a user may still be in a seating state, quickly and simply implement the backrest reclined sitting legs and a series of changes, and in order to improve comfort of seats. According to the present invention, the backrest and the leg portion may be interlocked pad seat comprising: a seat portion; backrest, which is backward tilting, and the seat comprising a backrest and a rear end portion of the lower rotary shaft connected frame; foot pad, which binds to the seat portion. Said seat portion comprising: a chassis; first slide member which is slidable back and forth on the chassis, and provided with a first rack on the sliding side; intermediate gear that meshes with the first rack, and by a rotating shaft provided on said chassis; second slide member, which can slide back and forth on the chassis and provided with a second rack that meshes with the intermediate gear, the sliding direction of the first sliding member opposite to the sliding direction.