A connection structure connects an insulated wire (10) to a terminal (30). The insulated wire has a conductor (11) covered with an insulating cover (14). The insulated wire has: a cover portion (16) where the conductor is covered with the insulating cover; an exposed portion (11b) where the conductor is exposed; and a crushed portion (18) including a boundary (13) between the exposed portion and the cover portion and subjected to crushing. The terminal includes: a plate base (31); a conductor crimping part (32) extended and bent from the plate base to crimp the exposed portion together with the plate base; and a cover crimping part (33) extended and bent from the plate base to crimp the cover portion together with the plate base. The boundary is positioned between the conductor crimping part and the cover crimping part.