A liquid discharge head includes a first bubbling chamber, a second bubbling
chamber
arranged thereon, and a discharge port portion communicated with the second bubbling
chamber with a difference in level. The sidewalls of the second bubbling chamber
contract in the direction toward the discharge port at an inclination of 10 to
45. On the circumferential portion of the upper face of the first bubbling
chamber in contact with an opening communicated with the second bubbling chamber,
an extrusion is formed continuously to surround the opening, in the direction toward
the main surface of the element base plate.
