To detach a negative pressure generating member storing room and a liquid storing room without leakage or scattering of an ink.

An ink tank 1 comprises a negative pressure generating member storing room 10 having an ink supply opening 12 for supplying an ink to an external recording head and an atmospheric air communicating opening 15 communicating with the atmosphere, for storing a negative pressure generating member for keeping a liquid in the inside, and a liquid storing room 50 having a liquid storing part for storing an ink, for forming a substantially sealed space except the communication with the negative pressure generating member storing room 10. The negative pressure generating member storing room 10 and the liquid storing room 50 are held integrally in the state covered with a guide member 100. The guide member 100 comprises a slide part 101 for limiting the detaching direction of the storing rooms 10, 50 in one direction.