The image processing apparatus includes an image inputting part configured to acquire a captured image produced by an image pickup system including an optical system and an image sensor, a filter producing part configured to produce an image restoration filter, and a restoration processing part configured to perform an image restoration process on the captured image by using the image restoration filter to produce a restored image. The filter producing part is configured to set amplification factors for respective frequency components in the image restoration filter according to a frequency characteristic of an alias signal that may be generated in the image sensor.