A modular jack (100) includes an insulative housing (2) and a terminal-receiving part (3) having a pair of terminals (4) therein received in the housing (2). The terminal-receiving part (3) includes a pair of through apertures (341) accommodating the terminals (4), a leading-wire notch (325) positioned behind the apertures (341) and a leading-wire space (324) communicating with the leading-wire notch (325). A hole (211) is defined in a corresponding side wall (21) of the housing (2). A pair of wires (344) connecting to leading-wire end (41) of the terminals (4) extends through the leading-wire notch (325) and leading-wire space (324) out of the hole (211) of the side wall (21) of the housing (2).