To provide an automatic workpiece supply device contributing to cost reduction without deforming workpieces with excellent working efficiency by automatically and vertically stacking the workpieces such as frames successively carrying by being continuously processed without causing displacement.

A large number of workpieces can be stacked upward in a storage tool by an opening-closing type chuck capable of gripping/opening the workpieces sent from a carrying body and repetition of gripping of the workpieces by chuck, rotation of the chuck by rotation of a rotary shaft and opening of the workpieces from the chuck. The chuck is formed by openably-closably installing two gripping pieces on the rotary shaft, and the two gripping pieces are mutually energized in the closing direction by a closing tool, and open stoppers arranged on the work gripping side and the work opening side by contacting with the gripping pieces. The tail end of the carrying body has a positioning body for positioning the workpieces in a gripping position. A workpiece gripping position has a sensor. The chucks are arranged by two sets or more, and can be simultaneously or separately operated.