The invention provides a connector plug in which a necessary and sufficient engaging force of a latch can be ensured irrespective of the thickness of a metal case. The connector plug of the invention has: a synthetic-resin made body (10) having a fitting portion (11) to which a counter connector socket is to be fitted, and which is projected from one end side; contacts (20) which are held by the body (10); and a metal case (40) which covers the body (10). A latch (30) which, when the fitting portion (11) of the body (10) is inserted into the counter connector socket, causes the fitting portion to be engaged with the counter connector socket, and which is formed by a metal plate is configured separately from the metal case (40). The latch (30) is held by the body (10).