PURPOSE: To prevent generation of frictional sound at a vertical route part and others and to realize travelling with less sound by making a side run-out preventive roller of resin without rubber elasticity.

CONSTITUTION: A travel carriage 1 consists of a main body 40 guided by a travel rail and a conveyor 60 for classification provided on its upper part, and it travels on a specific route at specified speed by using attraction force and resiliency of a magnet by a linear motor 30 and a secondary conductor 42. This travel carriage has a roller for travelling placed on the upper surface of the travel rail, left and right upper part side run-out preventive rollers 47 facing the upper part both side surfaces of the rail for travelling and left and right lower part side run-out preventive rollers 51 facing the lower part both side surfaces of the travel rail. By making the lower part side run-out preventive rollers 51 with large vertical motion against the travel rail of resin without rubber elasticity like nylon, frictional sound is scarcely generated even when the travel carriage 1 slides in the vertical direction against the both side surfaces of the travel rail.