To provide a beam material fitting structure and a beam material support fitting not requiring fitting-up work with a bolt, reducing a time of erection work, and commonly usable for beam materials different in gradients and spans.

An engagement groove 22 is formed on the lower surface side of both ends of a roof beam 17 erected between eaves beams 14A, 14, and a plurality of bolt passing holes 25 are formed in the same circumference having a radius R. A metal support fitting 20 is fitted to the upper surface of the over water side eaves beam 14A and the vertical surface of the under water side eaves beam 14B. The metal support fitting 20 has a horizontal support bar 34 and a plurality of bolt passing holes 35 formed in the same circumference having the radius R. The roof beam 17 is supported and temporarily stopped by the engagement of the support bar 34 and the engagement groove 22. Further, the bolt 42 is passed through the bolt passing holes 25, 35 to fix the roof beam 17 to the metal support fitting 20.