To provide a log barrier connection structure which prevents the swinging inclination of a horizontal member, and allows the horizontal member to be connected to a support member at an arbitrarily inclined angle according to a slope.

The log barrier is set up by connecting the support member 1 and the horizontal member 2 extended between cores of the respective support members 1 via plate-like connection fittings. Specifically a flat connection fitting 6 which has been bolted to the horizontal member 2 via fixing bolt holes 11, 12 is inserted into a slit 4 formed at the support member 1 at a location where a bolt hole 15 is formed on one side of the support member, and a pivoting bolt hole 10 formed at the flat connection fitting is matched with the bolt hole 15 formed at the support member 1. On the other hand, a bent connection fitting 5 which has been bolted to the horizontal member 2 via fixing bolt holes 8, 9 is inserted into the slit so that the bent internal surface thereof abuts on the flat connection fitting 6 on the other side of the support member, and the pivoting bolt holes 10, 7 are matched with the support member bolt hole 15, and a pivoting bolt 13 is penetrated into the bolt holes 15, 10 and 7 on the one side of the support member 1, and a nut 13a is screwed into the bolt 13. Thus the horizontal member 2 is rotated upward/downward about the pivoting bolt 13 as a fulcrum to adjust its angle, and then fixed to the support member according to the slope.