An image position detecting device is disclosed that detects an image position based on a reflected light from an image carrier that reflects a light irradiated from a light emitting source. The device includes first and second light receivers that are spaced apart in a moving direction of the image carrier such that the first light receiver detects a toner image adhered on and being moved by the image carrier before the second light receiver detects the toner image, and a comparison output unit that compares first and second analog signals input from the first and second light receivers to determine whether a level of the first analog signal is higher than a level of the second analog signal, and outputs the comparison result as an output signal in binary form. The first and second analog signals are input to the comparison output unit at different levels.