A wireless tag collective reading device of this invention comprises a rack to store the wireless-tag-equipped articles which are mounted on the wireless-tag-equipped article by printing a chip portion and an antenna portion connected to the chip portion, the chip portion emitting tag information in response to electromagnetic waves, and an antenna unit which applies, to the wireless-tag-equipped articles stored in the rack, electromagnetic waves for the emission of the tag information, and receives electromagnetic waves for the tag information emitted from the wireless tag, wherein the device controls the directivity, intensity, and phase of the electromagnetic waves emitted from the antenna unit to apply the electromagnetic waves to the wireless-tag-equipped article at a given position stored in the rack, controls the relative positions of the antenna unit and the rack, and reads the tag information from a signal received by the antenna unit.