To provide an air floating belt conveyor which is small size and capable of mass transportation.

A belt bearing trough is formed with a top notched trough shape and horizontal cylindrical body and arranged up and down. A sealed space is formed with protective covers 11, 13 at an upper section of an upper cylindrical body 10 and a lower cylindrical body 12, a carrier side belt 1a and a return side belt 1b are borne by a lower inner surface of the cylindrical body, a compressed pipe communicates with compressed air source and supplying compressed air and being along the running direction is connected to the lower part of filler holes 28a, 38a, bored at the lowest part of the cylindrical bodies 10, 12. A compressed air filler hole of a side face of an inside (recess side) of the upper cylindrical body 10 and a side face of an inside (recess side) of the lower cylindrical body 12 is bored at the curved part. The compressed air pipe is connected to the filler hole and communicates with compressed air source, compressed air exhaust port is formed at the both sealed space surrounding both cylindrical bodies 10, 12 a belt reversing system reversing the upper and lower face before and after guiding the return side belt into the inside of the lower cylindrical body is provided at the front and the rear of the lower cylindrical body 12.