Extensive growth in the volume of irregular brain cells in known as brain tumor. Human brain is surrounded by stiff skull. There are various issues occurred due to growth of any tumor inside this restricted space. The malignant and benign are two main categories of the brain tumor. The skull is pressurized to enlarge from inside in case of growth of any benign or malignant tumor. This tumor leads to harm in brain and it may be dangerous to life also. The brain tumor is divided into two kinds - primary or secondary. The brain tumor detection techniques have various phases. In this research work approach of CNN is proposed for the brain tumor detection. This work takes in account some metrics for examining the competence of new algorithm.