A motor control device that controls a three-phase brushless motor including a rotor and field coils (18U, 18V, 18W), comprising: a driving circuit that includes three series circuits each formed by connecting two switching elements (31 UH and 31 UL, 31 VH and 31 VL, 31 WH and 31 WL) in series corresponding to three phases, where the series circuits are connected in parallel between a power supply and a ground, characterized in that regenerative diodes (32 UH, 32 UL, 32 VH, 32 VL, 32 WH, 32 WL) are connected in parallel to the respective switching elements; and the motor control device further comprises a controllable region identifying means that identifies a rotor rotation angle region in which driving of the three-phase brushless motor is possible as a controllable region when one of the switching elements (31 UH, 31 UL, 31 VH, 31 VL, 31 WH, 31 WL) has short-circuit faulted, wherein when the rotor of the three-phase brushless motor is rotated in a state where all switching elements other than the switching element that has short-circuit faulted are off, in a case where a rotor rotation angle region in which a load current flows in neither of two normal phases is defined as a possible region, a rotor rotation angle region in which a load current flows in either one of the two normal phases is defined as an indeterminate region, and a rotor rotation angle region in which a load current flows in both of the two normal phases is defined as an impossible region, the controllable region identifying means is arranged to identify a region consisting of the possible region and the indeterminate region or the possible region as the controllable region. a driving circuit that includes three series circuits each formed by connecting two switching elements (31 UH and 31 UL, 31 VH and 31 VL, 31 WH and 31 WL) in series corresponding to three phases, where the series circuits are connected in parallel between a power supply and a ground, characterized in that regenerative diodes (32 UH, 32 UL, 32 VH, 32 VL, 32 WH, 32 WL) are connected in parallel to the respective switching elements; and the motor control device further comprises a controllable region identifying means that identifies a rotor rotation angle region in which driving of the three-phase brushless motor is possible as a controllable region when one of the switching elements (31 UH, 31 UL, 31 VH, 31 VL, 31 WH, 31 WL) has short-circuit faulted, wherein when the rotor of the three-phase brushless motor is rotated in a state where all switching elements other than the switching element that has short-circuit faulted are off, in a case where a rotor rotation angle region in which a load current flows in neither of two normal phases is defined as a possible region, a rotor rotation angle region in which a load current flows in either one of the two normal phases is defined as an indeterminate region, and a rotor rotation angle region in which a load current flows in both of the two normal phases is defined as an impossible region, the controllable region identifying means is arranged to identify a region consisting of the possible region and the indeterminate region or the possible region as the controllable region.