A linear conveyor device includes a slider having a linear motor mover; a straight-line conveyance part formed of a connected body of modules each having a linear motor stator and first and second guide rails for guiding movement of the slider on an upper surface of the module; and a cover member. The cover member covers the upper surface of the module so as to cover and conceal the linear motor stator and the first and second guide rails from above. The slider has a shape which allows the slider to be fitted on the cover member in a movable manner in an extending direction of the straight-line conveyance part.