The Land price in Tokyo Vicinity was, increased 65.3% than Last year. so, it trend to get Subway constructed in deeper Underground. But, the subway Construction Cost is more increaseel beeause it is needed long works term, all modernized facilities beside that, deeper subway cocstruction works brought another task such as deeper entrance shaft sinking, Ventilation escapeway, all Underground water Treatment. In addition, Civil Act must be also amended became at Present landowner covers ground and Underground.