Abstract: An electrical connector includes a plug connector and a receptacle connector to be fitted with each other. The plug connector includes a number of metal contact layers alternately formed on both sides of a flexible insulating plate, and a plug housing of an insulator for holding and fixing the insulating plate. Each of the metal contact layers has a contact portion and a tail portion, the former being thinner than the latter for maintaining the flexibility and electric conductivity of the former and maintaining the mechanical strength of the latter. The receptacle connector includes a receptacle housing of an insulator having a fitting groove into which the metal contact layers together with the insulating plate are inserted, and receptacle contacts made of worked elastic metal pieces mounted alternately on both sides of the fitting groove correspondingly to the metal contact layers of the plug connector.