An apparatus for attaching a tag on a neck portion of an article is disclosed. The apparatus includes an article-carrying member, a tag-supplying device, and a tag-carrying device disposed beyond the article-carrying member along a carrying direction of the article. The tag-carrying device includes two pairs of paired traveling belts disposed right and left of the tag and inclined so that each of the belts has a starting portion higher than the article and an ending portion of approximately the same height as a shoulder of the article. The tag-carrying device is adapted for carrying a tag synchronously with the carried article while holding both side edges of the tag between the upper and lower traveling belts to thereby insert a head of the article into a tag aperture and attach the tag to the neck portion of the article.