Lunacy defines as a mental disease which causes to interrupt personal relationship with reality and undistinguished of mistake. The disease itself has important legal effects such as exemption of lunacy from punishment and nullity legal practices – such legal supports from lunatic person because some people simulate insanity in order to escape from liability. So recognition of lunacy and reasons and elements are essential. It should be taken in to consideration which Mental diseases are not limited to lunacy, it embrace extensive group of disease nevertheless Lawgiver don’t support the patients. In this essay has been attempt except to recognition lunacy and its legal effects, the legal condition of other mental diseases and the lawgiver focus of attention be examined.