Abstract: Apparatus is provided for setting up and collapsing long rows of seats for stadiums or auditoriums, wherein each seat is provided with gravity counter-balancing spring means such that setting up or collapsing an extended row of seats may be done from one end of the row with a minimum of distortion along the row or force required. Provision is made for automatic operation by means of a small electric motor which may be remotely controlled. Additional provision is made for locking each set of an extended row of seats in either the set up or collapsed positions and for unlocking them in response to the initial action of means for changing the seats from one position to the other.