An image capturing apparatus includes an image capturing unit which converts an optical image of an object into an electrical signal, and an optical member arranged on the object side of the image capturing unit. The image capturing apparatus also includes an alien substance removing unit configured to execute an alien substance removal operation to remove alien substances adhering to the surface of the optical member, an environmental condition detection unit configured to detect the environmental condition around the image capturing unit or around the optical member, and a control unit configured to control the alien substance removal operation on the basis of the detected environmental condition.