Abstract: A machine for assembling uppers directly on assembly forms which comprises means for removably blocking at least a form against rotation and translation, means for holding an upper predisposed for string lasting assemblage and an insole which is externally covered with glue on the form, grasping members for removably engaging the string projecting from the upper whose movement may be controlled so as to pull the string in order to have the tip and the heel of the upper adhere to the glue of the insole placed on the form, and finally elements for pressing the uppers so as to cause them to adhere to the insole.