An adsorbent comprising a zeolite having a pore diameter of not less than 4.5 angstroms and not more than 7.3 angstroms as a principal component, which can adsorb xenon under ordinary temperatures and pressures or under ordinary temperatures and low xenon partial pressures. In addition, a xenon adsorbing device comprising an adsorbent, a container of a vapor poorly-permeating material, which houses the adsorbent, and a joint part which joins the container to a xenon enclosure space, in which the adsorbent is communicated with the xenon enclosure space. Thereby, the present invention provides an adsorbent which recovers xenon directly from the used equipment in which xenon is enclosed with efficiency under ordinary temperatures and pressures or under ordinary temperatures and low xenon partial pressures, and a xenon adsorbing device using the adsorbent.