Patent ID: 8113633

Claim:
A liquid ejecting head comprising: a passage unit made by laminating a plurality of plates including a first plate having a first through-hole and a second plate having a second through-hole, the second through-hole being larger than the first through-hole, wherein the first plate and the second plate are bonded together with an adhesive so that the first through-hole and the second through-hole are in communication with each other, where adhesive flows out between the first plate and the second plate during the bonding process and the affinity for the adhesive to adhere to the inner peripheral surface of the second through-hole is caused to be at least higher than the affinity for the adhesive to adhere around the opening of the first through-hole, so that the adhesive which flows out from between the first plate and the second plate during bonding is guided to the inner peripheral surface of the second through-hole, wherein the inner peripheral surface of the second through-hole is coated with a film that increases the affinity for the adhesive to adhere to the inner peripheral surface of the second through-hole.