A free flow conveyance system includes a plurality of linear conveyance apparatuses each having a plurality of unit conveyors linearly arranged, and a pivot conveyance apparatus having a unit conveyor which is arranged between the linear conveyance apparatuses being so arranged as to form a predetermined angle, wherein product sensors are arranged at the conveying-in side as well as at the conveying-out side of the respective unit conveyors of the linear conveyance apparatuses and the pivot conveyance apparatus, when a product is conveyed to a unit conveyor of the upstream side along the conveyance direction and product sensors of the unit conveyor become of the sensing-product state, in case respective product sensors of a unit conveyor of the downstream side along the conveyance direction are of the not-sensing-product state, these unit conveyors are driven respectively to convey the product, and when the product is consequently conveyed to the unit conveyor of the downstream side along the conveyance direction and conveying-out side product sensors thereof become of the sensing-product state, the respective adjacent unit conveyors are stopped, enabling free flow conveyance.