Provided is a substrate inverting device that can reverse the front and back of a substrate without causing damage and that can suppress a decrease in work efficiency due to inverting the substrate. A substrate inverting device that inverts the front and back of a substrate comprise: a rectangular frame shaped casing that encloses the circumference of a substrate to be inverted; a first holding unit that is joined to one edge of the casing so as to be able to rotate and that holds the substrate from the front side; a second holding unit that is joined to another edge of the casing facing the one edge so as to be able to rotate and that holds the substrate from the back side; and a support unit that supports the casing so that same can rotate about an axis in the horizontal direction while the substrate is held by the first holding unit and second holding unit.