The magnetostructural and magnetocaloric properties of CoMnGe1-xGaxB0.015 (x=0.05 and 0.06 are named Alloy-1 and Alloy-2, respectively) alloys have been investigated by X-ray powder diffraction, calorimetric and magnetization measurements. Both alloys have hexagonal structures at room temperature and show first order phase transition below room temperature. The entropy change-Delta S of these alloys are calculated as -22.1 J kg(-1) K-1 (for Alloy-1 alloy) and -27.1 J kg(-1) K-1 (for Alloy-2 alloy) under Delta H = 7 T. Magnetic hysteresis losses of these alloys are very small when compared with the undoped alloy. Considering the high magnetocaloric effect and low magnetic hysteresis features, boron doping on CoMnGe family alloys provides an alternative method to tailor magnetic and magnetocaloric properties. (C) 2013 Elsevier B.V. All rights reserved.