The J = 3 ← 2, K−1 = 2 and J = 4 ← 3, K−1 = 2 and 3 transitions were observed for the allene-1,1-d2 molecule. The B̄ = (B + C)/2 and (A−B̄)bp2 constants have been determined to be 7846.158 ± 0.01 MHz and 0.133 ± 0.005 MHz, respectively. The observed values of the two centrifugal distortion constants, DJ = 0.0024 ± 0.0005 MHz and DJK = 0.130 ± 0.005 MHz, were compared with the calculated to confirm the assignment of the weak spectra. The Stark effect of the J = 4 ← 3, K−1 = 3 transition was analyzed by comparing with computer-simulated spectrum, leading to the dipole moment of 0.0031 ± 0.0003 D.