A tray adapted to be loaded in a recording apparatus which comprises a transport roller transporting a medium in a first direction, a recording head moved in a second direction orthogonal to the first direction to record information on the medium, and a sensor, the tray comprising: a tray body, adapted to be transported in the first direction by the transport roller to a region opposing to the recording head; a set portion, adapted such that the medium is placed thereon; a first boundary line, defining two regions having different reflectivities and orthogonal to the second direction, the first boundary line being adapted to be detected by the sensor to provide a first reference position relative to the second direction; and a second boundary line, defining two regions having different reflectivities and orthogonal to the first direction, the second boundary line being adapted to be detected by the sensor to provide a second reference position relative to the first direction.