To provide a label printing method, in which no permeation of a photopolymerization initiator in a container develops even using the container made of a polyethylene.

A heat-shrinkable film 26 to be pasted on the side of a polyethylene container main body 16 is provided so as to print an ultraviolet curable ink on the rear surface side of the film 26. After that, by irradiating ultraviolet rays on a printed site in a nitrogen atmosphere, from which oxygen is excluded, the ultraviolet curable is cured. The ultraviolet curable ink is a white ink, which is made of a titanium oxide powdered pigment and hardly permeate light.