A detecting apparatus that uses a redundancy configuration comprising plural sensor sections including plural detecting sections, accurately performs abnormality detection and function continuation in a control apparatus such as an ECU in a case that abnormality is occurred in the sensor sections or a signal line, and has simple manufacturing processes, and an electric power steering apparatus equipped with the detecting apparatus. The apparatus includes plural sensor sections which include plural detecting sections that detect a same object or a same state quantity, and detects at least one of the state quantities in at least two of the sensor sections, wherein each of the sensor sections has a communication section that outputs the state quantities, which the detecting sections detect, as an error detectable signal.