An electric connector comprising: an insulating housing; and a conductive contact buried in the insulating housing so as to be exposed to a surface of the insulating housing, the conductive contact extending from a rear end portion to be coupled with a terminal part of a cable-shaped signal transmission medium to a front end portion toward a fitting-in counterpart connector side; wherein the insulating housing is provided with a contact engaging part covering at least a part of a rear end portion on an exposed surface of the conductive contact, the contact engaging part is provided with a guide inclined surface facing the cable-shaped signal transmission medium from both sides in a contact width direction perpendicular to an extending direction of the conductive contact to position the cable-shaped signal transmission medium, and the guide inclined surface is disposed on each of both sides of the cable-shaped signal transmission medium in a pair, and the paired guide inclined surfaces are formed so as to be separated from each other in a direction of rising from a cable mounting surface where the cable-shaped signal transmission medium is mounted; characterized in that: the conductive contact has a dimension in the contact width direction perpendicular to the extending direction, the dimension being narrowed at a terminal edge part provided at a rear end portion of the conductive contact in the extending direction, and a terminal width of the conductive contact, which is narrowed, is formed so as to be shorter than a minimum width between the contact engaging parts on the cable mounting surface where the cable-shaped signal transmission medium is mounted. an insulating housing; and a conductive contact buried in the insulating housing so as to be exposed to a surface of the insulating housing, the conductive contact extending from a rear end portion to be coupled with a terminal part of a cable-shaped signal transmission medium to a front end portion toward a fitting-in counterpart connector side; wherein the insulating housing is provided with a contact engaging part covering at least a part of a rear end portion on an exposed surface of the conductive contact, the contact engaging part is provided with a guide inclined surface facing the cable-shaped signal transmission medium from both sides in a contact width direction perpendicular to an extending direction of the conductive contact to position the cable-shaped signal transmission medium, and the guide inclined surface is disposed on each of both sides of the cable-shaped signal transmission medium in a pair, and the paired guide inclined surfaces are formed so as to be separated from each other in a direction of rising from a cable mounting surface where the cable-shaped signal transmission medium is mounted; characterized in that: the conductive contact has a dimension in the contact width direction perpendicular to the extending direction, the dimension being narrowed at a terminal edge part provided at a rear end portion of the conductive contact in the extending direction, and a terminal width of the conductive contact, which is narrowed, is formed so as to be shorter than a minimum width between the contact engaging parts on the cable mounting surface where the cable-shaped signal transmission medium is mounted. the conductive contact has a dimension in the contact width direction perpendicular to the extending direction, the dimension being narrowed at a terminal edge part provided at a rear end portion of the conductive contact in the extending direction, and a terminal width of the conductive contact, which is narrowed, is formed so as to be shorter than a minimum width between the contact engaging parts on the cable mounting surface where the cable-shaped signal transmission medium is mounted.