To provide a beam attaching structure of a shelf which can correspond to angles in both the up-and-down direction and the horizontal direction by one type of hardware.

Beam-retaining parts 33 are extended from both the upper and lower ends of a longitudinal plate part toward the front except for a strut-attaching part 32 forming a metal fixture 3 at one end of the longitudinal plate part. Then one bolt-attaching hole 34 is drilled in the strut-attaching part 32 and the beam-retaining part 33 respectively, and the strut-attaching part 32 is attached to a strut 1 by a bolt B1. Then the end of the beam 2 supported by the beam-retaining part 33 is fixed by a bolt B2. Because of it, the metal fixture 3 can be rotated in the up-and-down direction about the bolt B1 inserted to the bolt-attaching hole 34 which is drilled in the strut-attaching part 32. Since the beam 2 can be rotated in the horizontal direction about the bolt B2 inserted to the bolt-attaching hole 34 which is drilled in the beam-retaining part 33, the beam attaching structure can correspond to the inclination and curvature of the place where the shelf is installed by one type of metal fixture 3.