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In order to investigate the magnetic and the electrical properties of Mn2-xCuxSb (x =0.06, 0.10, and 0.15), the magnetization and the electrical resistivity measurements were carried out in the temperature range from 10 K to 300 K under magnetic fields up to μ0 H=5 T. The Curie temperature TC of Mn1.94Cu0.06Sb was determined to be 517 K. Mn1.94Cu0.06Sb showed a first-order magnetic transition from a ferrimagnetic (FRI) to an antiferromagnetic (AFM) phase at Tt = 117 K with a thermal hysteresis of approximately 20 K. The low-field magnetic data of Mn1.94Cu0.06Sb also showed an anomaly at 207 K, indicating a spin reorientation. With increasing x, Tt increases to 154 K (x = 0.15), whereas TC is almost constant for 0.06 ≤ x ≤ 0.15. The electrical resistivity changes abruptly by 25%-36% at Tt. By applying a magnetic field of μ0 H=5 T, Tt decreases and the width of the hysteresis increases. In addition, we confirmed that the value of the magnetization at low temperatures below Tt depends on the cooling process for a magnetic field.