PURPOSE: To accurately attach a label to the predetermined position of a container by adapting the label to the contour of the cavity of a mold before inserting the label by the inside contour of a label mold to internally connect the same to the transparent plastic of the container to allow the label to correspond to the contour of the container.

CONSTITUTION: During a period when a plastic container 56 is molded by a foil deep drawing machine or a thermoforming machine when a lower mold 5 is moved upwardly, label molds 21 thrown into two groups bring a new label 18 from a magazine rack 23. In this case, at first, the first group of the label molds 21 takes out the label 18 from the magazine rack 23 and the label 18 is fixed to the periphery of a label shaft 14. Next, the vacuum of a vacuum suction plate 48 is cut off to allow a vacuum to act on the label shaft 14 at the same time. As a result, the label 18 molded so as to be fitted to a contour is bonded to the label shaft.