To provide a connector in which a compact design of the connector can be achieved, and besides a retaining force for preventing withdrawal of a metal terminal can be further increased, a connector housing 10 includes terminal receiving chambers 11 into which metal terminals 30 can be inserted, respectively, from a rear side, elastic lances 12 for respectively retaining the metal terminals 30 to prevent rearward withdrawal of the metal terminals 30, an elastic deformation space 13 for the lances, and a front holder insertion space 16 which is provided at a front side of the elastic deformation space in continuous relation thereto such that a front holder can be inserted into a predetermined position in the front holder insertion space from the front side. The front holder 20 has lance holding portions 22 which enter the elastic deformation space to prevent elastic deformation of the lances when the front holder is mounted into the connector housing from the front side, and the lance and the lance holding portion have an engagement convex portion 12b and a retaining portion 23, respectively, which can be engaged with each other to prevent forward movement of the front holder and also to transmit a rearward force, applied from the metal terminal to the lance, to the front holder.