This paper examines the relation between hypnosis and amnesia, especially the independent between memory and memory consciousness. Fires, the phenomena of memory performance without memory consciousness, next the phenomena of memory consciousness without memory representation are dealt with. They are examines both cases under hypnosis and in normal cases. In both case, we can find that memory and memory consciousness are independent each other and that memory representation is neither necessary nor sufficient conditions for memory consciousness. Lastly, the roles of memory consciousness in our daily information processing are dealt with. Especially, the importance of memory consciousness in normal social life and the problem of self consciousness are discussed.