A wire harness comprising a connector and a cable, wherein: the connector is attached to a front end of the cable in a front-rear direction; the cable comprises coated signal cables each of which comprises a core wire made of conductor and an insulating coating made of insulator and surrounding and protecting the core wire, and an outer member; each of the signal cables has a protected portion and an exposed portion; the outer member protects the protected portions of the signal cables: the exposed portion is located forward of the protected portion and exposed outward of the outer member; the connector comprises terminals, a holding member, a shell and an impedance adjusting portion; the terminals are attached to the exposed portions of the signal cables, respectively; the holding member holds the terminals; the shell is made of metal and covers the holding member and has a predetermined surface which intersects with a perpendicular direction perpendicular to the front-rear direction; the impedance adjusting portion is closer to the exposed portions of the signal cables in the perpendicular direction than the predetermined surface is, the terminals are arranged in a pitch direction perpendicular to the front-rear direction; the impedance adjusting portion is formed as a part of the shell; and a size of the impedance adjusting portion in the pitch direction is equal to or more than two thirds of another size of the shell in the pitch direction but equal to or less than the size of the shell in the pitch direction, characterized in that a front end of the impedance adjusting portion is located between a front end and a rear end of the predetermined surface in the front-rear direction. the connector is attached to a front end of the cable in a front-rear direction; the cable comprises coated signal cables each of which comprises a core wire made of conductor and an insulating coating made of insulator and surrounding and protecting the core wire, and an outer member; each of the signal cables has a protected portion and an exposed portion; the outer member protects the protected portions of the signal cables: the exposed portion is located forward of the protected portion and exposed outward of the outer member; the connector comprises terminals, a holding member, a shell and an impedance adjusting portion; the terminals are attached to the exposed portions of the signal cables, respectively; the holding member holds the terminals; the shell is made of metal and covers the holding member and has a predetermined surface which intersects with a perpendicular direction perpendicular to the front-rear direction; the impedance adjusting portion is closer to the exposed portions of the signal cables in the perpendicular direction than the predetermined surface is, the terminals are arranged in a pitch direction perpendicular to the front-rear direction; the impedance adjusting portion is formed as a part of the shell; and a size of the impedance adjusting portion in the pitch direction is equal to or more than two thirds of another size of the shell in the pitch direction but equal to or less than the size of the shell in the pitch direction, characterized in that a front end of the impedance adjusting portion is located between a front end and a rear end of the predetermined surface in the front-rear direction. the exposed portion is located forward of the protected portion and exposed outward of the outer member; the connector comprises terminals, a holding member, a shell and an impedance adjusting portion; the terminals are attached to the exposed portions of the signal cables, respectively; the holding member holds the terminals; the shell is made of metal and covers the holding member and has a predetermined surface which intersects with a perpendicular direction perpendicular to the front-rear direction; the impedance adjusting portion is closer to the exposed portions of the signal cables in the perpendicular direction than the predetermined surface is, the terminals are arranged in a pitch direction perpendicular to the front-rear direction; the impedance adjusting portion is formed as a part of the shell; and a size of the impedance adjusting portion in the pitch direction is equal to or more than two thirds of another size of the shell in the pitch direction but equal to or less than the size of the shell in the pitch direction, characterized in that a front end of the impedance adjusting portion is located between a front end and a rear end of the predetermined surface in the front-rear direction.