A latch device for a swing door of an electric household appliance, includes a support fixable to the door; a fork-shaped latch member fitted in rotary manner to the support to cooperate, in use, with a fixed striker of the appliance; and a control button fitted to the support to slide in opposition to a first elastic element. The latch member is movable, in opposition to a second elastic element on the support, between a first operating position, in which it does not engage the striker, and a second operating position, in which it does engage the striker. A contact member is fitted to the support to slide parallel to the control button in opposition to a third elastic element, and operatively interposed between the control button and the latch member to selectively lock the latch member in the second operating position, and to be selectively locked by the latch member when the latch member is in the first operating position.