We present measurements of the NQR and NMR spectra and the nuclear rel
axation rate, 1/T-1, of Al-27 in UPd2Al3 from 0.06 K to 270 K. The bro
adening of NQR lines and the rapid decrease of 1/T-1 below 14K indicat
e the appearance of antiferromagnetic order. The temperature dependenc
e of 1/T-1 in the superconducting state shows the existence of line no
des in the superconducting energy gap, and also the existence of resid
ual density of states arising from strong resonant scattering by non-m
agnetic impurities or imperfections. Together with the decrease of the
Knight shift in the superconducting state, it is expected that d-wave
superconductivity appears in UPd2Al3.