An audio jack includes an insulative housing (10) including a tapered, inclined rear end (13) having four sides wherein two horizontal sides are wider than the other two vertical sides, all four sides being inclined and coupled together; first, second, third, and fourth terminals (21, 22, 23, and 24) disposed in respective grooves (131, 132, 133, and 134) and each having an outer terminal (212, 222, 231, or 241) inclined and projected from the rear end (13); a plate (20) in the housing (10) served as a plug stopper; and a metal shell (30) enclosing the housing (10) and including inclined legs 32. The housing (10) further comprises two internal cavities (1311, 1321) positioning two of the first, second, third, and fourth terminals (21, 22, 23, and 24) respectively. The third and fourth terminals (23 and 24) are served as a switch upon insertion and removal of a plug (4).