An RFID tag includes a first flexible sheet covering a surface of a base part, an antenna and an IC chip; a second flexible sheet covering an another surface of the base part; a first reinforcing member including third and fourth sheets and covering the chip and a connecting portion of the chip and the antenna, the third sheet having flexibility and elasticity and being disposed on the first sheet, the fourth sheet having flexibility and being disposed on the third sheet; a second reinforcing member including fifth and sixth sheets and covering the chip and the connecting portion, the fifth sheet having flexibility and elasticity and being disposed on the second sheet, the sixth sheet having flexibility and being disposed on the fifth sheet; and an outer member having flexibility and elasticity and covering the first and the second sheets and the first and the second reinforcing members.