An image capturing apparatus is applied in air or in a non-air medium and includes a lens assembly, an image sensor and a removable cover lens. The lens assembly includes at least one lens element. The image sensor is disposed on an image surface of the lens assembly. When the image capturing apparatus is applied in the non-air medium, the removable cover lens, the lens assembly and the image sensor are disposed along an optical axis in order from an object side to an image side.