A harness band includes: a long band body; a flange body defining a passage hole; and a leg body for being retainingly mounted in a mounting hole in a panel, wherein: the band body had retaining row-like teeth; the flange body includes an elastic tongue piece and having a lock claw and the elastic tongue piece having the lock claw is extended so that it can be inserted into the mounting hole in the panel when the leg body is retainingly mounted in the mounting hole in the panel, and when the elastic tongue piece is bent in a direction to bring the lock claw thereof out of engagement with the retaining row-like teeth of the band body, an outer surface of the elastic tongue piece facing away from the lock claw abuts against an inner peripheral surface of the mounting hole in the panel.