Abstract: The invention relates to a device for introducing and positioning a label the walls of a mold formed in two parts separated by a mold joint, in a machine with a reciprocating cycle for the extrusion/blow molding of hollow bodies, of the type comprising:--a member for storing labels disposed above the open mold,--a vertically mobile jack, disposed above the open mold, associated with means adapted to grip a label in the storage member, then to lower this label into the open mold,--means adapted to maintain the deposited label against the walls of the mold during the path of transfer of this mold, wherein a jack adapted to generate a reciprocating vertical movement is associated with a vertical rigid rod bearing at its end a rigid member adapted to pivot about this end, this pivoting rigid member comprising two rigidly connected arms, one forming a pivot stop when its abuts on the upper part of the mold, the other, vertical, bearing at its other end the label to be deposited.