Toyohashi Khristos Church was dedicated to Matthew the Evangelist in 1915 with design of Izo Kawamura, a priest in charge of the sacred property management. Through the Overall Survey of Modernization Heritages in Aichi Prefecture took place in 2003-2005, primary sources including the original building drawings and photographs were found. And using these references, it will be possible to analyse how Kawamura prepared the plans and executed the construction supervision in cooperation with local believers. Referring to the model plan provided by St. Nikolai and the existing churches at Kyoto and Osaka, Kawamura found the principle of the layout and the proportion. An important instrument was a pair of large compasses to draw a circles and diagonals. As the site did not have enough length, and the size calculated by the principle had fractions, Kawamura had to adjust the ideal church plan to the site condition. His unique interpretation and originality were reflected in slightly decreasing tiered bell tower like Buddhist tower. Through his careful supervision stationing at the site quite long time, such adjustment could be possible.
