A start control apparatus mounted on a vehicle comprising an internal combustion engine and a motor having a rotating shaft that can be rotated in synchronization with an output shaft of the internal combustion engine, said start control apparatus characterized by comprising: a crank angle sensor mounted on the output shaft and configured to output a signal in association with rotation of the output shaft; a resolver mounted on the rotating shaft and configured to detect a rotor angle, which is an angle position of the rotating shaft; and a controlling device (21, 22) configured to perform start control associated with the internal combustion engine on the basis of a temporary crank angle, from a start of the internal combustion engine until determination of a crank angle, which is an angle position of the output shaft, when the output shaft is rotated by the motor to start the internal combustion engine, wherein said controlling device (21, 22) sets a stop angle, which is an angle based on the rotor angle detected by said resolver at a previous stop of the internal combustion engine, as an initial value of the temporary crank angle, said controlling device (21, 22) increases the temporary crank angle by a predetermined value at each time of outputting the signal from said crank angle sensor, said controlling device (21, 22) performs the start control on the basis of the crank angle instead of the temporary crank angle after the determination of the crank angle, and if the crank angle is advanced from the temporary crank angle when the crank angle is determined, said controlling device performs fuel injection control or ignition control immediately after switching from the temporary angle to the crank angle, based on a condition that an injection angle to perform the fuel injection control included in the start control, or an ignition angle to perform the ignition control included in the start control, is included between the temporary crank angle and the crank angle. a crank angle sensor mounted on the output shaft and configured to output a signal in association with rotation of the output shaft; a resolver mounted on the rotating shaft and configured to detect a rotor angle, which is an angle position of the rotating shaft; and a controlling device (21, 22) configured to perform start control associated with the internal combustion engine on the basis of a temporary crank angle, from a start of the internal combustion engine until determination of a crank angle, which is an angle position of the output shaft, when the output shaft is rotated by the motor to start the internal combustion engine, wherein said controlling device (21, 22) sets a stop angle, which is an angle based on the rotor angle detected by said resolver at a previous stop of the internal combustion engine, as an initial value of the temporary crank angle, said controlling device (21, 22) increases the temporary crank angle by a predetermined value at each time of outputting the signal from said crank angle sensor, said controlling device (21, 22) performs the start control on the basis of the crank angle instead of the temporary crank angle after the determination of the crank angle, and if the crank angle is advanced from the temporary crank angle when the crank angle is determined, said controlling device performs fuel injection control or ignition control immediately after switching from the temporary angle to the crank angle, based on a condition that an injection angle to perform the fuel injection control included in the start control, or an ignition angle to perform the ignition control included in the start control, is included between the temporary crank angle and the crank angle.