To provide a multi-conductor connector having the function of protecting a metal contact piece inside.

This multi-conductor connector is equipped with a plug 2 having a plug housing 51, in which an electric cable containing plural conductors is introduced and a base 9 on which plural contact pads 76 mounted on the bottom part of the plug housing are arranged, and a receptacle 3, containing a receptacle housing 22 with a metal contact piece holding member 45 having an opening part to be inserted with the plug on its upper part and plural metal pieces 61 disposed on its lower part. The receptacle is equipped with a shutter 6, disposed in the upper part of the metal contact piece, which covers the upper part of the metal contact piece by closing, when the plug is not inserted in the receptacle housing and enables bringing the contact pad of the plug, in contact with the metal contact piece by opening by being energized by the plug, when the plug is inserted, is provided in this multi-conductor connector.