The infrared (IR) spectrum of PD 3 has been recorded in the 1580–1800cm −1 range at a resolution of 0.0027cm −1 . About 2400 rovibrational transitions with J ′ =K ′ ⩽22 have been measured and assigned to the ν 1 (A 1 ) and ν 3 (E) stretching fundamentals. These include 506 “perturbation-allowed” transitions with selection rules Δ(k−l)=±3. Splittings of the K ′′ =3 lines have been observed. Effects of strong perturbations are evident in the spectrum. Therefore the rovibrational Hamiltonian adopted for the analysis explicitly takes into account the Coriolis and k-type interactions between the v 1 =1 and v 3 =1 states, and includes also several essential resonances within these states. The rotational structure in the v 1 =1 and v 3 =1 vibrational states up to J ′ =K ′ =18 was reproduced by fitting simultaneously all experimental data. Thirty-four parameters reproduced 1950 transitions retained in the final cycle with a standard deviation of the fit equal to 4.9×10 −4 cm −1 (about the precision of the experimental measurements).