A connector includes a crimping portion (12) provided at an inner surface with projections (13) having inclined sides (19), the crimping portion (12) being provided with a combination of a base portion (14) and first and a second protruding portions (15) and (16) protruding from the base portion (14), the first protruding portion (15) having a distal end part (15a) located at an inside of a distal end part (16a) of the second protruding portion (16), the crimping portion (12) having a ring-shaped section perpendicular to a length direction of the aluminum electric wire (21), the projections (13) being projected into surface areas of the aluminum electric wire (21), with distorted regions formed along the inclined sides (19) in a surface part of the aluminum electric wire (21).