Upon plug and receptacle connectors of an electrical connector being fitted with each other, positioning recesses of a block of the plug connector engage positioning protrusions of a housing of the receptacle connector to achieve positioning of the two connectors in their width directions. Inclined portions of receptacle contacts of the receptacle connector are commensurate with inclined portions of inserting holes of the housing so that a backup function of the housing for the receptacle contacts is adjusted to obtain a stable connection between the plug and receptacle connectors. First chamfered portions of the receptacle contacts engage recesses of the plug contacts to generate tactile clicks and to achieve the positioning and contacting between the plug and receptacle contacts. The plug contacts are embraced between contact portions and elastic portions of the receptacle contacts to obtain a stable connection between the both contacts.