An electric wire with a terminal comprising: an electric wire that includes a conductor portion having conductivity, and an insulator portion covering an outside of the conductor portion and having an insulating property; a terminal connection portion electrically connectable to a counterpart terminal; a conductor crimp portion that is crimped to the conductor portion exposed from the insulator portion; and a sheath crimp portion separated from the conductor crimp portion, and crimped to the insulator portion, wherein the sheath crimp portion includes a base portion on which the insulator portion is mounted, and a barrel piece portion extending from the base portion and crimped with the insulator portion such that the insulator portion is wrapped between the barrel piece portion and the base portion, the insulator portion is in contact with the base portion and the barrel piece portion in a state in which the sheath crimp portion is crimped to the insulator portion, the insulator portion comprises a first end on the conductor crimp portion side, at a side in contact with the barrel piece portion, the insulator portion further comprises a second end on the conductor crimp portion side, at a side in contact with the base portion, and a distance from the first end to the conductor crimp portion is shorter than a distance from the second end to the conductor crimp portion, the insulator portion includes a cut-away portion at the side in contact with the base portion, where a distance from a tip of the conductor portion to an end face of the cut-away portion of the insulator portion is longer than a distance from the tip of the conductor portion to an end face of the insulator portion except the cutaway portion, the cut-away portion is located on the base portion side in a state in which the sheath crimp portion is crimped to the insulator portion, characterized in that the insulator portion further includes a slit, and the slit is formed on the insulator portion at a position opposite to a position of the cut-away portion across the conductor portion, extends in a direction intersecting the extending direction of the electric wire, and has a depth less than a thickness of the insulator portion. an electric wire that includes a conductor portion having conductivity, and an insulator portion covering an outside of the conductor portion and having an insulating property; a terminal connection portion electrically connectable to a counterpart terminal; a conductor crimp portion that is crimped to the conductor portion exposed from the insulator portion; and a sheath crimp portion separated from the conductor crimp portion, and crimped to the insulator portion, wherein the sheath crimp portion includes a base portion on which the insulator portion is mounted, and a barrel piece portion extending from the base portion and crimped with the insulator portion such that the insulator portion is wrapped between the barrel piece portion and the base portion, the insulator portion is in contact with the base portion and the barrel piece portion in a state in which the sheath crimp portion is crimped to the insulator portion, the insulator portion comprises a first end on the conductor crimp portion side, at a side in contact with the barrel piece portion, the insulator portion further comprises a second end on the conductor crimp portion side, at a side in contact with the base portion, and a distance from the first end to the conductor crimp portion is shorter than a distance from the second end to the conductor crimp portion, the insulator portion includes a cut-away portion at the side in contact with the base portion, where a distance from a tip of the conductor portion to an end face of the cut-away portion of the insulator portion is longer than a distance from the tip of the conductor portion to an end face of the insulator portion except the cutaway portion, the cut-away portion is located on the base portion side in a state in which the sheath crimp portion is crimped to the insulator portion, characterized in that the insulator portion further includes a slit, and the slit is formed on the insulator portion at a position opposite to a position of the cut-away portion across the conductor portion, extends in a direction intersecting the extending direction of the electric wire, and has a depth less than a thickness of the insulator portion.