To provide a residence easily reformed in response to a handicapped person and a weakly person depending on a wheel chair even when a resident reaches them in future.

The residence has a lavatory 4 adjacently arranged to a bathroom 3, a water closet 2 adjacently arranged to either of the bathroom 3 or the lavatory 4 and a Japanese-style room 5 adjacently disposed to the bathroom 3, the lavatory 4 or the water closet 2 and used as a bedroom in future, The water closet 2 is surrounded by an exterior wall 101 as a structural wall constituting a building skeleton, partition walls 102 and 103 and a removable opening wall 7.