A position detection apparatus which detects a position of an object, the position detection apparatus comprising: a scale which includes a pattern circumferentially and periodically formed on a circle whose center is a predetermined point, the scale being configured to rotate depending on a displacement of the object; a sensor unit relatively movable with respect to the scale; and a signal processor configured to process an output signal of the sensor unit to obtain position information of the object, wherein one of the scale and the sensor unit is configured to move integrally with the object, characterized in that the sensor unit comprises: a first detector configured to detect a first partial pattern of the pattern, formed in a first region apart from the predetermined point by a first distance; and a second detector configured to detect a second partial pattern of the pattern, formed in a second region apart from the predetermined point by a second distance different from the first distance, wherein the signal processor is configured to: calculate an error component contained in at least one of a first detection signal outputted from the first detector and a second detection signal outputted from the second detector based on the first detection signal and the second detection signal, the error component being a component due to a difference between a rotation center of the scale and the predetermined point; and output the position information of the object based on the first detection signal, the second detection signal, and the calculated error component. a scale which includes a pattern circumferentially and periodically formed on a circle whose center is a predetermined point, the scale being configured to rotate depending on a displacement of the object; a sensor unit relatively movable with respect to the scale; and a signal processor configured to process an output signal of the sensor unit to obtain position information of the object, wherein one of the scale and the sensor unit is configured to move integrally with the object, characterized in that the sensor unit comprises: a first detector configured to detect a first partial pattern of the pattern, formed in a first region apart from the predetermined point by a first distance; and a second detector configured to detect a second partial pattern of the pattern, formed in a second region apart from the predetermined point by a second distance different from the first distance, a first detector configured to detect a first partial pattern of the pattern, formed in a first region apart from the predetermined point by a first distance; and a second detector configured to detect a second partial pattern of the pattern, formed in a second region apart from the predetermined point by a second distance different from the first distance, wherein the signal processor is configured to: calculate an error component contained in at least one of a first detection signal outputted from the first detector and a second detection signal outputted from the second detector based on the first detection signal and the second detection signal, the error component being a component due to a difference between a rotation center of the scale and the predetermined point; and output the position information of the object based on the first detection signal, the second detection signal, and the calculated error component. calculate an error component contained in at least one of a first detection signal outputted from the first detector and a second detection signal outputted from the second detector based on the first detection signal and the second detection signal, the error component being a component due to a difference between a rotation center of the scale and the predetermined point; and output the position information of the object based on the first detection signal, the second detection signal, and the calculated error component.