121 at the label releasing position b so as to be smallest with taking account of a variation of the thickness of the material 10 carried by the material transfer mechanism 400 that is it is preferably to adjust the distance between the surface of the material 10 having the greatest thickness and the label sucking face 121 so that it is smallest in the initial condition the piston rods 210 b and 220 b of the cylinders 210 and 220 are fit into the bases 210 a and 220 a thereby the label holder 101 is positioned at the label receiving position a while the label sucking face 121 faces the label transfer mechanism 301 when the label 12 is transferred to the label receiving position a by the label transfer mechanism 301 air in the air suction chamber 110 is sucked by a sucking member not shown in the figures provided outside of the label holder 101 then air is sucked from a plurality of air suction pipes 133 of which the openings are formed at the label sucking face 121 and the label 12 is sucked by the label sucking face 121 specifically at the openings of the recesses 134 in this embodiment the openings of the air suction.