In this paper, the solid-state magnetic refrigeration properties of Ni50Mn34In16-xAlx (x=0, 0.5, 1, and 1.5 at.%) was evaluated. For this purpose, bulk samples with a diameter of 8 mm were fabricated using a suction-melting system. A homogenization annealing process was carried out at 1073 K for 4 hours in a tube furnace under an Argon gas atmosphere. XRD and FE-SEM were used for structural and microstructural characterization at room temperature. DSC was employed to study the phase transformation in the temperature range of 200-375 K with a cooling rate of 10 K/min. Temperature-dependent magnetic properties were evaluated using a magnetic property measurement system (MPMS) under a constant magnetic field of 2 T at a temperature range of 175-375 K with a cooling rate of 3 K/min. Furthermore, the magnetic and magnetothermal properties were analyzed using a VSM equipped with a cooling-heating system at the magneto-structural transformation and magnetic phase transition temperature range. The results indicated that the doping of Al led to the formation of the martensite phase at ambient temperature. It was also observed that with increasing Al the characterization temperatures of the first-order phase transformation decreased. The substitution of In by Al resulted in a gradual decrease in saturation magnetization and a weakening of magnetocaloric properties. As the Al content was increased to 1.5 at. %, the saturation magnetization decreased from 49 eum/g to 8.5 eum/g, the magnetic entropy change decreased from 3.4 J/kg·K to 1.1 J/kg·K, and the refrigeration capacity reached from 109.83 J/kg to 8.1 J/kg.