Abstract: The delayed action striking device comprises, in combination with a pressure cap beneath which there is a not air-tight closed air chamber, defined on the other side by a stiff diaphragm and in communication with a member delaying the bursting, a firing pin which can slide against the bias of a spring into a small cylinder carried by the diaphragm and controlled through a lever which is acted on by a safety catch. Two bursting charges are concentrically placed, of which the inner one contains the detonator which rests beneath the firing pin. The safety catch comprises a small rod, inserted within the casing of the mine between a flap carried by the control of the firing pin and a projection integral with the casing of the mine.