The invention relates to a pocket stamp (1) comprising a housing (2), which is configured in the shape of a case (3) having two articulated, shell-shaped housing parts (4, 5), which can be displaced from a closed position, in which they are detachably connected to one another, into an open position, in which a die plate (24) accommodated in one of the housing parts (4) and protruding over the edge thereof is present in the operating or impression position thereof, in which the other housing part (5) is offset toward the rear in relation to the die plate (24), wherein in one housing part (5) at least one detent element (10) in the form of a hook (18) is provided and in the other housing part (4) a detent element (16) in the form of a ledger (20) cooperating with said hook (18) is provided, one of the detent elements (16) being resiliently movable.