An apparatus for aligning and positioning a plurality of pieces of food dough having a triangular shape on a conveyor. The apparatus includes an upstream conveyor conveying the pieces of food dough having a triangular shape, a downstream conveyor faster than the upstream conveyor, a separating apparatus separating a plurality of the pieces of food dough set in a line in the perpendicular direction to the moving direction of the conveyor from the following row of the pieces and translocating them from the upstream conveyor to the downstream conveyor, a laying-out and rotating apparatus laying-out and rotating a plurality of the pieces set in a line so that they are positioned at predetermined intervals in the perpendicular direction to the moving direction of the conveyor and are rotated 90 degrees in a predetermined rotational direction, and a detecting device detecting the pieces.