A latch device includes a case, a rod juts out from inside the case so as to adopt an advanced position, a rod biasing member biases the rod in a jutting out direction pushing the rod out from inside the case, a lock mechanism that includes a slide cam that moves together with the rod in the jutting out direction and a rotation cam that is relatively rotatable with respect to the slide cam about an axis of the rod, with the lock mechanism locking the rod in a retracted position in the case due to the rotation cam engaging with the slide cam and rotating due to the rod being pressed in, a guide mechanism for rotating the rod about the axial direction thereof when the rod is advancing or retracting, and an engagement portion that engages with an engaged portion when the rod has been locked.