Sanjo Station is an underground stop with two island platforms serving four tracks, and is the largest station on the section between Shichijo Station and Demachiyanagi Station, in central Kyoto.
待避設備を備えた配置2面4線のホームを持つ地下駅で、京都市の中心部にある七条駅～出町柳駅間では最も規模が大きい。