An electric erecting chair includes a support member, a backrest, a pair of arms, a cushion and an electric erecting mechanism The support member has a first connecting structure at each side thereof and a second connecting structure at the rear end of each side. The backrest has a connecting structure detachably connected to the second connecting structure of the support member. The pair of arms is detachably connected to the first connecting structure. The cushion is disposed on the support member and the electric erecting mechanism disposed under cushion the operative to push a front portion of the cushion upwardly.