An aspect of the invention is a radio wave shielding case including, a case body having at least a first facet and a second facet connected to the first facet, the first facet including an opening configured to surround a reading facet of a wireless tag reader antenna, a wireless tag slit which is formed in the second facet of the case body and enables a wireless tag to be inserted in the case body so as to face the reading facet of the antenna surrounded by the opening, and a radio wave absorber which covers the opening of the case body and an inner surface except for the wireless tag slit.