To provide a belt-driven roller conveyor with easy maintenance capable of prolonging a service life of the belt by driving a conveying roller of a magnetic substance belt in the state of being adsorbed to a permanent magnet without imparting a tension to the belt.

Magnetic substance rollers 3a are fixed to one ends of the large number of the conveying roller shafts 13 and the large number of rollers 4 made of permanent magnet are arranged in the state that they are adsorbed to two magnetic substance rollers adjacent to a lower part of this magnetic substance roller. An endless belt 20, made of ferromagnetic substance, for rotating the magnetic substance roller 3a and the conveying roller 3 adsorbed to a lower part of a roller row made of permanent magnet is arranged. An interlocking roller 6 having a large friction resistance is provided below a space between a shaft driven by the ferromagnetic substance belt and a not- driven shaft against the conveying roller in a range not contacted with the ferromagnetic substance belt 20 at a head part and a tail part of the conveyor. All conveying rollers are driven by pressing and interlocking the interlocking roller to the conveying roller 3 by a spring 11 to convey articles.