PURPOSE: To improve the work performance and safety of overhang part fitting work.

CONSTITUTION: In this overhang part supporting structure for supporting an overhang part 11 protruding from the outer side face 12 of a building body by a supporting member 15, the supporting member 15 is provided with a column 16 erected with the lower end part 16a thereof fixed to the ground, and a beam 17 jointed to the upper end part 16b of the column 16 and extended almost vertically to the outer side face 12. One end part 17b of the beam 17 is fixed to the outer side face 12 side, and the overhang part 11 is placed on the beam 17.