Electric connector

1. An electric connector having a housing provided with a plurality of longitudinally-extending wire holding portions, disposed side by side and extending parallel to one another, for holding insulations of insulated wires of which core wire portions are covered by the insulations:

• each wire holding portion comprising;
  
  a pair of wire holding pieces disposed as facing each other to form a longitudinally-extending wire holding groove for receiving an insulated wire;
  
  a longitudinally-extending, electrically-conductive contact disposed and retained in the wire holding groove; and
  
  wire hold-down pieces for guiding, in a vertical direction at a right angle to an axial direction of the insulated wire, the insertion of the insulated wire into the wire holding groove, as well as for preventing the insulated wire from coming off from the wire holding groove, andthe plurality of wire holding portions comprising;
  
  a first wire holding portion disposed at a first distance from a rear of the connector and having wire hold-down pieces arranged to hold an insulated wire in a wire holding groove at a first wire hold-down position with respect to the axial direction of the insulated wire; and
  
  a second wire holding portion disposed at a second distance from the rear of the connector and disposed adjacent to the first wire holding portion, and having wire hold-down pieces arranged to hold an insulated wire in a wire holding groove at a second wire hold-down position different from the first wire hold-down position with respect to the axial direction of the insulated wire;
  
  wherein the first distance and the second distance are different are different from one another.