A terminal fitting comprising: a body portion having substantially square tube shape rod and having an inserting space for inserting a tab of a mating terminal therein; an elastic contact piece provided to face the inserting space, having a configuration as to be extended like a cantilever in a direction of an insertion and pull-out of the tab with respect to the inserting space through a wall-shaped portion constituting the body portion, and having a contact portion to come in contact with the tab; and an elastic reinforcing piece provided on an opposite side to the inserting space with the elastic contact piece interposed therebetween, having a configuration as to be extended like a cantilever in the direction of the insertion and pull-out of the tab from the wall-shaped portion constituting the body portion, and having an extended end provided in the vicinity of the contact portion of the elastic contact piece, wherein: the elastic contact piece is elastically flexed through an abutment of the tab on the contact portion and the elastic reinforcing piece is elastically flexed through an abutment of the elastic contact piece flexed elastically in a state in which the tab is inserted in the inserting space; an extended end of the elastic contact piece is provided in a slightly rear part from a base end of the elastic reinforcing piece with respect to the direction of the insertion of the tab; and the extended end of the elastic contact piece abuts on the wall-shaped portion constituting the body portion in a state in which the contact portion abuts on the tab; wherein the wall-shaped portions are constituted by a lower surface wall opposed to the contact portion within the inserting space, left and right side surface walls (17, 18) which are errected from both side edges of the lower surface wall at an almost right angle, and an upper surface wall which is parallel with the lower surface wall, characterized in that the upper surface wall includes an excessive flexure control portion taking a bending configuration toward the terminal connection portion side. a body portion having substantially square tube shape rod and having an inserting space for inserting a tab of a mating terminal therein; an elastic contact piece provided to face the inserting space, having a configuration as to be extended like a cantilever in a direction of an insertion and pull-out of the tab with respect to the inserting space through a wall-shaped portion constituting the body portion, and having a contact portion to come in contact with the tab; and an elastic reinforcing piece provided on an opposite side to the inserting space with the elastic contact piece interposed therebetween, having a configuration as to be extended like a cantilever in the direction of the insertion and pull-out of the tab from the wall-shaped portion constituting the body portion, and having an extended end provided in the vicinity of the contact portion of the elastic contact piece, wherein: the elastic contact piece is elastically flexed through an abutment of the tab on the contact portion and the elastic reinforcing piece is elastically flexed through an abutment of the elastic contact piece flexed elastically in a state in which the tab is inserted in the inserting space; an extended end of the elastic contact piece is provided in a slightly rear part from a base end of the elastic reinforcing piece with respect to the direction of the insertion of the tab; and the extended end of the elastic contact piece abuts on the wall-shaped portion constituting the body portion in a state in which the contact portion abuts on the tab; wherein the wall-shaped portions are constituted by a lower surface wall opposed to the contact portion within the inserting space, left and right side surface walls (17, 18) which are errected from both side edges of the lower surface wall at an almost right angle, and an upper surface wall which is parallel with the lower surface wall, characterized in that the upper surface wall includes an excessive flexure control portion taking a bending configuration toward the terminal connection portion side. the elastic contact piece is elastically flexed through an abutment of the tab on the contact portion and the elastic reinforcing piece is elastically flexed through an abutment of the elastic contact piece flexed elastically in a state in which the tab is inserted in the inserting space; an extended end of the elastic contact piece is provided in a slightly rear part from a base end of the elastic reinforcing piece with respect to the direction of the insertion of the tab; and the extended end of the elastic contact piece abuts on the wall-shaped portion constituting the body portion in a state in which the contact portion abuts on the tab; wherein the wall-shaped portions are constituted by a lower surface wall opposed to the contact portion within the inserting space, left and right side surface walls (17, 18) which are errected from both side edges of the lower surface wall at an almost right angle, and an upper surface wall which is parallel with the lower surface wall, characterized in that the upper surface wall includes an excessive flexure control portion taking a bending configuration toward the terminal connection portion side.