PURPOSE:To prevent a paper pot from being disconnected by arranging a stopper forwardly of a supply part such that a roller for supporting a rear end of a housing box is disposed upwardly of a rapid traverse roller behind the stopper and thereby the housing box falls from its front end in its falling. CONSTITUTION:A lowest stage box 2 among overlapped housing boxes 2 supplied to a supply part 9 of a conveyor table 1 is rapidly fed by a rapid traverse roller 14 and forced to pass through a gap 32 under a push plate 29 of a stopper 27. Paper pots 4 on the housing boxes 2 on and after a second stage are brought into contact with the push plate 29 in their front end parts 37 and prevented from advancing. When a rear end 36 of the lowest stage box 2 passes through a front end part 30 of the second stage box 2, the front end 30 falls onto the rapid traverse roller 14. However, the rear end 36 stays thereupon on a support roller 33, and hence the box 2 is rapidly fed while being forwardly inclined. Thereupon, the push plate 29 is forwardly inclined, whereby the paper pot 4 is securely separated from the push plate 29 without being disconnected.