This thesis deals with the special relation between Japanese swords and knives. No one has done any research about contact points or even a common origin of these cutting tools. After having done some serious research for such connections I found several. The magnificent Japanese sword and the commonplace used kitchen knife have more in common than it seemed before. I?ve structured my thesis, which has been preceded by a six month research at japan in the following manner: It starts with a history of Japanese blades including important events in connection with this. Furthermore there is a report on blacksmith, forging technology and the contemporary value and use of the Japanese sword. Following a detailed introduction into the topic of Japanese sword, the Japanese knife comes up as a topic itself. This topic starts with an introduction in history, followed by the issue of ironwork, origin of name, in art and literature, and spiritually aspects to the point of knife at presence. A solitary chapter is dedicated today?s most important knives. After catching an overview about sword and knife the names of two important wrought places in japan are stated. These places, called Sanjo and Seki are of greatest importance in history and for development of japans blacksmith and cutlery. The reasons therefore will be explained in each chapter separately. After an introduction to history of city, blacksmith and cutlery I attached a chapter about each of these town?s most important sword- and knife experts to complete the corresponding topic. In brief biographies there are told about smiths, researchers and wholesalers, who were significantly involved in the development of Japanese knife. The information therefor comes of self-made interviews with these mentioned people. These interviews have arisen at my six month stay at japan. Sparse Japanese literature about this topic was translated with help of Mrs. Dr. Noriko Hori, also during my stay at Japan.