PROBLEM TO BE SOLVED: To provide a novel robbery countermeasure device which may be employed on a store side such as a convenience store.SOLUTION: A magnet unit 1 of a robbery countermeasure device comprises: a net holder (first holder member 10 and second holder member 20) for holding a net N; a permanent magnet 25 embedded in the net holder; a ceiling attachment part 40 attached to a ceiling; an iron core 45 fixed to the ceiling attachment part; a coil 35 wound around a shaft core of the iron core; and an operation switch for electrifying the coil. When the coil is not electrified, the iron core is sucked by the permanent magnet, so that the net holder is held to the ceiling attachment part, and by electrification to the coil, the iron core is magnetized to a direction of rebounding to the permanent magnet, and the net holder is detached from the ceiling attachment part by the rebound force.SELECTED DRAWING: Figure 4
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