A hinge mounting structure is provided whose appearance can be improved. In a hinge mounting structure including a hinge (1) having a first piece (3) and a second piece (4) that are coupled together via a shaft (2) in such a manner as to be rotatable relative to each other, the first piece (3) being mounted on a side jamb (6), the second piece (4) being mounted on a door (5), the side jamb (6) is provided with a protruding portion (8) protruding forward of a wall surface, and a center (C) of the shaft (2) is placed backward of a front surface line (X) of the protruding portion (8) of the side jamb (6).