To provide a screw drive conveying device capable of traveling a carriage in an optional direction, changing an attitude of an object to be conveyed in a conveying direction by a simple constitution and efficiently conveying the object to be conveyed by making the object to be conveyed have an attitude corresponding to the shape of the object to be conveyed.

The carriage 120 is engaged to a rotated and driven screw shaft 110 and conveyed and driven in a conveying direction. The carriage includes an engaging means 122 provided by being fixed in position in the conveying direction to be engaged to the screw shaft 110, and an auxiliary engaging means 130 provided to be movable by a prescribed distance in the conveying direction to be engaged to the screw shaft 110.