A work instruction device (1) instructs a worker who carries a worker terminal (2) to execute work. To perform the instruction, the work instruction device (1) having a storage mean performs the following steps: a step of selecting not-yet-allocated work stored in the storage means; a step of calculating for each worker a work route through which each worker patrols work positions with the position of the worker terminal (2) as the start point, the calculation being based on information on the position of the worker terminal (2) measured based on a signal emitted from the worker terminal (2) and based on information on the position of the not-yet-allocated work stored in the storage means; a step of selecting a worker having the shortest work route movement distance, the worker being selected as the worker in charge of the not-yet-allocated work; and a step of instructing the not-yet-allocated work to the selected worker in charge.
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