Patent ID: 8256879

Claim:
A self-sealing unit in which a liquid supply route for supplying liquid of a liquid source to a liquid ejecting head is formed, the self-sealing unit comprising: a pressure chamber formed on the liquid supply route; a valving element that opens or closes the liquid supply route to supply the liquid to the pressure chamber; a biasing member that biases the valving element toward the direction to close the liquid supply route; a film that is fixed to the body of the self-sealing unit to demarcate the pressure chamber and that causes the valving element to move against the biasing force of the biasing member so that the valving element is into an open state, by being displaced toward the pressure chamber side on the basis of a negative pressure acting in the pressure chamber and informing the displacement to the valving element; and a convex section arranged at a position between the valving element and a wall surface of the pressure chamber, where the distance between the valving element and the wall surface is shorter than that in other areas, away from the valving element and the wall surface in a manner that the convex section supports the film.