The crystal structure, magnetic structure, and magnetic properties of Nd_1-xNa_xMnO₃ (x=0, 0.15, and 0.20) compounds were studied using magnetization and neutron powder diffraction techniques. The magnetic ordering is found to undergo a transition from A-type antiferromagnetic (AFM) structure for x=0 to pseudo charge-exchange (CE)-type AFM phase for x=0.20 through the spin canted ferromagnetic (FM) phase for x=0.15. Two magnetic transitions at 75K and 15K were observed for x=0 sample and are ascribed to AFM ordering of Mn ions and ferrimagnetic ordering of Nd ions, respectively. In the case of x=0.15, a canted FM ordering at around 80K and a pseudo CE-type AFM magnetic structure at 5K were observed. The x=0.20 sample exhibits a charge-ordering transition at 180K followed by a spin-glass like transition at around 40K. The magnetic structure of x=0.20 sample below 125K is found to be pseudo CE-type AFMstructure. The propagation vectors associated with Mn³⁺ and Mn⁴⁺ sublattices are (0 0 1/2) and (1/2 0 1/2), respectively. The maximum refined magnetic moments of Mn³⁺ and Mn⁴⁺ ions in x=0.20 sample are found to be 3.20 l_B and 3.00 l_B, respectively.