To provide a sliding door capable of being easily attached to an existing partition, and a fixture for use in the same.

A sliding door 1 for a partition is provided slidably in a lateral direction along a wall surface of a partition 2, and a lower end thereof is provided with a movable member movable in sliding directions in the state of contact with a floor surface. The sliding door 1 for the partition is provided with a first guide groove 26 with an opened upper portion and a second guide groove with an opened lower portion in such a manner that groove directions of them are the sliding directions. The sliding door 1 for the partition includes a fixture 31 that comprises guide portions movable relative to the first guide groove 26 and the second guide groove in the groove directions of them, respectively, and an attachment portion for being detachably attached to the partition. The fixture 31 is used for the sliding door 1 for the partition.