A layered food packaging system includes: a carrier device configured to convey a sandwich in a horizontal posture in which a layering direction of the sandwich is substantially vertical; a temporary placement table configured to temporarily place the sandwich thereon in a vertical posture in which the layering direction of the sandwich is substantially horizontal; a first robot and a second robot configured to grip the sandwich that is conveyed by the carrier device, lift the sandwich from the carrier device, change the posture of the sandwich from the horizontal posture to the vertical posture, and temporarily place the sandwich on the temporary placement table; and a third robot configured to grip the sandwich that is temporarily placed on the temporary placement table, and insert the sandwich into a bag for packaging the layered food.