A moisture adsorbing device 1 comprising a type Y zeolite, and an NOx adsorbing device 2 being put in place on an exhaust-gas downstream side of the moisture adsorbing device 1, and comprising a zeolite that includes a transition metal ion in the cation exchange sites are included. In NOx adsorbing apparatuses, since the less the moisture content in exhaust gases is the more the NOx adsorbing capability improves, the NO adsorbing capability in low-temperature region is improved especially by means of the combination with a moisture adsorbing device that comprises a type Y zeolite whose Al2O3 proportion is great and whose moisture adsorbing amount is great compared with the other zeolites.