Motor drive control device and motor drive control method

The invention provides a motor drive control device (1) capable of reliably acquiring the current of a two-phase coil by a single shunt current detection method. The motor drive control device (1) includes: a motor drive unit (2) including an inverter circuit (2a); a single current detection circuit (2c) that is connected to the DC line of the inverter circuit (2a) and detects a current flowing through the DC line; and a control circuit unit (4) that performs analog-to-digital conversion processing of the current, acquires detection results of a first current and a second current, which are currents of two-phase coils among the three-phase coils, from the current detection circuit (2c) in a half cycle of one PWM cycle, and performs PWM control of the motor drive unit (2) by acquiring the detection results of the first current and the second current in the half cycle of one PWM cycle. When the A/D conversion processing of at least one of the first current and the second current fails, the detection result is o