To provide an angled gate door used as a gate unit easily improved in external design and functionality of an abutting part of a master-slave door while having excellent workability by easily coping with an installation angle between a master door and a slave door according to a construction site regarding the gate unit with the master-slave door arranged nonlinearly between gate posts.

In the gate unit comprising the master door and the slave door mounted between the gate posts, an angle adjusting member is provided on at least one abutting part side of the slave door or master door, over the upper and lower sides of the door.