The invention relates to a method for manufacturing a container by stretch blow-molding from a preform made of plastic material in a forming unit, the forming unit comprising a mold, an elongation rod that is movable heightwise inside the mold, the method comprising, in succession, a pre-blow-molding step and a blow-molding step, the method also comprising a step of boxing of a handle, a rising phase of the elongation rod being initiated before the blow-molding step, the boxing step being initiated after the rising of the elongation rod, the handle being formed on the extension axis of the elongation rod.