PROBLEM TO BE SOLVED: To provide a head mechanism of a label affixing device, a label affixing device and a label affixing method capable of uniformly affixing a label on a sticking surface of an object having an inclination while having a simple structure. A head mechanism 100 of a label affixing device includes a label holder 110 that holds a label to be affixed to an object, and a shaft 120 whose tip is fixed to the label holder 110 and extends in a direction away from the label holder 110. , A through hole 131 through which the shaft 120 is inserted is formed, and the diameter of the through hole 131 is larger than the diameter of the shaft 120. It includes an urging member 140 that urges the label holder 110 so as to be separated. [Selection diagram] Fig. 3
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