Horie is a native of Osaka Prefecture. He began playing rugby when he was a fifth-grade student, and later captained the Teikyo University rugby team.[2][3]
In 2012, Horie played for Japan, and in New Zealand for Otago in the National Provincial Championship, where he attracted the attention of the Melbourne Rebels recruiting staff.[3] In November 2012, the Rebels announced Horie's signing to play Super Rugby in Australia.[5][6][7][8][9] In 2013 he became the first Japanese player to play for an Australian Super Rugby side[3] often on the reserves bench.[2]