Ink tank

An ink tank mountable on an ink jet recording apparatus and configured to emit light, the ink tank comprising:

• a light-emitting portion;
• and
• a light-guiding portion configured to guide light emitted from the light-emitting portion,
• wherein the light-guiding portion includes two surface facing each other, an output surface formed at a top of the light-guiding portion and configured to output the guided light, and a reflecting surface slanted for the two surfaces and the output surface to a light-receiving portion disposed at a main body side of the ink jet recording apparatus
• wherein the two surfaces connected by the output surface and the reflecting surface, one of the two surfaces is a display surface configured to display information about a status of the ink tank by outputting the guided light, and the reflecting surface reflects the guided light for the display surface.