Since the Hakuba no sechi e (seasonal court banquets) took place in front of this gate, it is also called 'Aouma no jin,' and 'Nantan-mon gate' (南端門) as it is located on the south side of the Palace, and '外門' as it is at the outer wall, and also '南面僻杖中門.'
白馬節会がこの門前で行われた事から「青馬陣」ともいい、内裏の南にあるから「南端門」ともいい、外郭にあるから「外門」ともいい、「南面僻杖中門」ともいった。