A CMOS image sensor and a method for manufacturing the same are provided. The CMOS image sensor enlarges an area of a real image and prevents interference between adjacent pixels by forming a plurality of microlenses on a convex surface and forming a light blocking layer in the space between each of color filters. The CMOS image sensor can include photodiodes, a first planarization layer, R, G, B color filter layers, a second planarization layer having holes filled with a light blocking layer, and a plurality of microlenses.