Abstract: When constructing a unit building having a middle scale or more such as especially an apartment house, a long and large size building unit capable of reducing construction period while increasing construction efficiency and being economically provided can be achieved. Detachable temporary reinforcing members 2 are provided on both of the short side surfaces of the building unit body 1A, respectively. The temporary reinforcing member 2 has lower end portion on which a projecting portion 3 is downwardly projected.

Abstract: When constructing a unit building having a middle scale or more such as especially an apartment house, a long and large size building unit capable of reducing construction period while increasing construction efficiency and being economically provided can be achieved. Detachable temporary reinforcing members 2 are provided on both of the short side surfaces of the building unit body 1A, respectively. The temporary reinforcing member 2 has lower end portion on which a projecting portion 3 is downwardly projected.

Abstract: Provided is a prefabricated building 1 constructed by combining a previously manufactured wall panel and roof panel on a mounting surface. This prefabricated building 1 includes an outer wall portion 20 which is formed by wall units 2A, 2B in which two wall panels 21, 21 are flexibly connected, a roof portion 3 formed by a plurality of roof panels 31 and an upper end side supporting portion 5 having a jig 51 which places an upper end of the roof panel and an extension bar 52 which transfers a load to the mounting surface, the jig 51 and the extension bar 52 being separatably connected, and the upper end side supporting portion 5 being set up in a portion surrounded by the outer wall portion 20 to project above an upper end face of the outer wall portion 20.