A connector, comprising at least one terminal fitting and a connector housing with at least one cavity into which the at least one terminal fitting is to be at least partly inserted, wherein: the terminal fitting is formed with a pair of left and right stabilizers for preventing improper insertion which extend from one surface of a main portion; the cavity of the connector housing includes at least one terminal insertion hole into which the main portion of the terminal fitting is closely fitted, a widened entrance part provided at a front side of the terminal insertion hole, and at least one insertion path formed in one surface of the terminal insertion hole to permit passage of the stabilizers; and the stabilizers are insertable to a proper position while the stabilizers pass in the insertion path when the terminal fitting is inserted in a proper posture, whereas the stabilizers come into contact with a hole edge portion adjacent to or at a angular position of the terminal insertion hole different of a angular position where the insertion path is provided to prevent any further insertion of the terminal fitting when the terminal fitting is inserted in an improper posture radially displaced from the proper one; characterized in that a pair of left and right posture displacing portions for displacing an extending posture of the stabilizers to increase an engaging margin of the stabilizers with the hole edge portion by being engaged with the stabilizers of the terminal fitting inserted in the improper posture is provided at or near the hole edge portion of the terminal insertion hole, wherein the stabilizers of the terminal fitting are formed to assume an oblique posture, extending obliquely with respect to the one surface of the main portion towards a widthwise center of the main portion, the widthware center being defined an imaginary plane arranged in longitudinal direction of the main portion and dividing the main portion into two parts, wherein the posture displacing portions are formed with at least one taper surface for displacing the stabilizers toward a vertical posture by coming into contact with the stabilizers, wherein the pair of left and right stabilizers are formed to assume such oblique postures that respective extending ends gradually come closer to each other, wherein the pair of left and right posture displacing portions project backward from the hole edge portion of the terminal insertion hole, and wherein the taper surface is formed on an outer corner portion of the projecting end of each posture displacing portion. the terminal fitting is formed with a pair of left and right stabilizers for preventing improper insertion which extend from one surface of a main portion; the cavity of the connector housing includes at least one terminal insertion hole into which the main portion of the terminal fitting is closely fitted, a widened entrance part provided at a front side of the terminal insertion hole, and at least one insertion path formed in one surface of the terminal insertion hole to permit passage of the stabilizers; and the stabilizers are insertable to a proper position while the stabilizers pass in the insertion path when the terminal fitting is inserted in a proper posture, whereas the stabilizers come into contact with a hole edge portion adjacent to or at a angular position of the terminal insertion hole different of a angular position where the insertion path is provided to prevent any further insertion of the terminal fitting when the terminal fitting is inserted in an improper posture radially displaced from the proper one; characterized in that a pair of left and right posture displacing portions for displacing an extending posture of the stabilizers to increase an engaging margin of the stabilizers with the hole edge portion by being engaged with the stabilizers of the terminal fitting inserted in the improper posture is provided at or near the hole edge portion of the terminal insertion hole, wherein the stabilizers of the terminal fitting are formed to assume an oblique posture, extending obliquely with respect to the one surface of the main portion towards a widthwise center of the main portion, the widthware center being defined an imaginary plane arranged in longitudinal direction of the main portion and dividing the main portion into two parts, wherein the posture displacing portions are formed with at least one taper surface for displacing the stabilizers toward a vertical posture by coming into contact with the stabilizers, wherein the pair of left and right stabilizers are formed to assume such oblique postures that respective extending ends gradually come closer to each other, wherein the pair of left and right posture displacing portions project backward from the hole edge portion of the terminal insertion hole, and wherein the taper surface is formed on an outer corner portion of the projecting end of each posture displacing portion.