A top plate conveyor device, in which vibrations and noises are reduced, and the structure is simple and the production assembly and handling are easy. Top plates 110 are removably provided on a rubber toothed belt 120 by engagement members 111 provided on the back surfaces of the top plates 110, and engagement members 111 include sandwiching portions 112 which sandwich the toothed belt 120 from both outer sides in the width direction and terminate in pawl portions 113, which snap-connect the top plates to the toothed belt 120.