An angle detection device includes an angle sensor configured to detect a rotating magnetic field that changes periodically in response to a rotation angle of a motor and output a first detection signal and a second detection signal having a phase difference whose value is not an integer multiple of 90°, and a logic signal generation section configured to generate a first logic signal using the first detection signal, generate a second logic signal having a phase different from that of the first logic signal using the second detection signal, and generate a third logic signal having a phase different from those of the first and second logic signals using the first and second logic signals.