Patent ID: 7387373

Claim:
A liquid ejecting head comprising: a flow passage formation section including: a plurality of nozzle openings, ejecting liquid therefrom; a plurality of pressure generation parts, corresponding to the nozzle openings respectively; a plurality of liquid supply passages, communicating with the pressure generation parts respectively for supplying liquid thereto; and a plurality of partition wall parts, each separating one liquid supply passage and its corresponding pressure generation part from another liquid supply passage and its corresponding pressure generation part; a sealing section, sealing the flow passage formation section; and a head case section, provided on the sealing section, wherein the partition wall parts respectively include liquid supply passage partition wall parts which separate adjacent liquid supply passages; wherein the sealing section seals an area of the flow passage formation section corresponding to both the liquid supply passage partition wall parts and the liquid supply passage of the flow passage formation section, and the sealing section has a first area and a second area being greater in thickness than the first area; wherein both the first area and the second area are opposed to the liquid supply passage; wherein the head case section is separated by a vacancy from the sealing section at the first area opposed to the liquid supply passage; wherein the sealing section has a first part and a second part being greater in thickness than the first part; wherein the first area of the sealing section is formed with the first part; wherein the second area of the sealing section is formed with the first part and the second part; wherein the head case section, provided on the flow passage formation section through the sealing section, has an expansion coefficient different from that of the flow passage formation section; wherein the second part inside of the area where the head case section is provided on the sealing section is placed in a part of each of the liquid supply passage partition wall parts; wherein the second part has a first portion and a second portion which are separated from each other; wherein the first portion of the second part is placed only on a base side close to the pressure generation parts in the liquid supply passage partition wall parts; wherein the second portion of the second part is placed only on a tip side away from the pressure generation parts in the liquid supply passage partition wall parts; and wherein a reinforcement member not contributing to expansion is placed in an intermediate part between the tip side and the base side of the liquid supply passage partition wall parts.