A wireless tag communication device for communicating with a wireless tag conveyed by a conveyance mechanism, includes radiation regions from which a radio wave is emitted. The radiation regions include a first region extending along a first direction crossing a conveyance direction of the tag and having a first length in the first direction, a second region extending along the first direction and having a second length in the first direction, a third region extending along the conveyance direction and having a third length in the conveyance direction, and a fourth region extending along the conveyance direction and having a fourth length in the conveyance direction. The device further includes a controller configured to cause at least one of the first, second, third and, fourth regions to emit a polarized wave towards the tag. Each of the first and second regions partially overlaps the third and fourth regions.