PURPOSE:To vary a conveying interval in regular sequence, by installing an interval altering device, whose tilt angle varies along with movements, in the sidepiece of a conveyed work, and constituting it so as to be supported to a moving device via this altering device. CONSTITUTION:An interval adjusting device being constituted of supports 4, 5, rollers 6, 8 and pins 3 and 7 free of rotation, is attached to both sides of a conveyed work 1, and these rollers 6 and 8 are supported to guides 9 and 10 whose interval becomes narrowed by degrees. With this, rollers 8 and 8 come into contact with each other, supported on a tilting conveyor 2, and the conveyed work 1 moves down to a lower end stopper (unillustrated herein) in consecutive order as in a natural descent system owing to an inclination of the conveyor. At this time, with action of the interval adjusting device, its sequential interval is kept up, thus it is supported on the conveyor 2. And, if a conveyed work 1n is pulled out, other conveyed works 1 moves piece by piece as adjusting their sequential intervals each. With this constitution, each interval is alterable in consecutive order.