A connector attachable to a front end of a cable in a front-rear direction, the cable comprising 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 which protects the signal cables, wherein: the connector comprises terminals, a holding member, a shell, an assigned portion and an impedance adjusting portion; the terminals are configured to be attached to the signal cables, respectively, under an attached state where the connector is configured to be attached to the front end of the cable; the holding member holds the terminals; the shell covers the holding member and has a predetermined surface which intersects with a perpendicular direction perpendicular to the front-rear direction; the assigned portion is configured to be placed on the outer member of the cable under the attached state; the connector comprises a coupling portion which couples the assigned portion and the impedance adjusting portion to each other; the impedance adjusting portion is located forward of the assigned portion in the front-rear direction and located inward in the perpendicular direction in comparison with both the predetermined surface and the assigned portion, the terminals are arranged in a pitch direction perpendicular to the front-rear direction; the shell is formed of an upper shell made of metal and a lower shell made of metal; the impedance adjusting portion is integral with the upper 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 comprises terminals, a holding member, a shell, an assigned portion and an impedance adjusting portion; the terminals are configured to be attached to the signal cables, respectively, under an attached state where the connector is configured to be attached to the front end of the cable; the holding member holds the terminals; the shell covers the holding member and has a predetermined surface which intersects with a perpendicular direction perpendicular to the front-rear direction; the assigned portion is configured to be placed on the outer member of the cable under the attached state; the connector comprises a coupling portion which couples the assigned portion and the impedance adjusting portion to each other; the impedance adjusting portion is located forward of the assigned portion in the front-rear direction and located inward in the perpendicular direction in comparison with both the predetermined surface and the assigned portion, the terminals are arranged in a pitch direction perpendicular to the front-rear direction; the shell is formed of an upper shell made of metal and a lower shell made of metal; the impedance adjusting portion is integral with the upper 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.