Patent ID: 8191991

Claim:
A liquid ejecting head unit comprising: a liquid ejecting head that has a nozzle row in which a plurality of nozzle openings are arranged in parallel; a base plate that holds the liquid ejecting head; a position determining pin, which is fitted into a position determining pin inserting hole disposed in one of the liquid ejecting head and the base plate, disposed on the other; and a guide plate that has a pin support hole inserted into the position determining pin, wherein the guide plate is configured by a lowermost layer portion that is bonded to the other in which the position determining pin is disposed, a middle layer portion disposed on the lowermost layer portion, and an uppermost layer portion that is disposed on the middle layer portion, wherein the pin support hole is configured by a first opening portion disposed in the uppermost layer portion, a second opening portion disposed in the lowermost layer portion, and a communication opening portion that is disposed in the middle layer portion and allows the first opening portion and the second opening portion to communicate with each other, and wherein the position determining pin is supported by the first opening portion and the second opening portion.