An endoscope apparatus includes: a light source unit that emits white illumination light or narrow band illumination light； an image sensor having pixels； a filter unit arranged corresponding to the pixels and including filters having a filter for passing blue light, and a filter for passing the blue light and one of green light and red light, the number of the filters for passing the green light being not less than half of the number of all the filters of the filter unit, and the number of the filters for passing the blue light being not less than the number of the filters for passing the green light； a selecting unit that selects, from the pixels, a luminance component pixel depending on types of illumination light； and a demosaicing processing unit that generates a color image signal having color components based on the luminance component pixel.
