Patent ID: 7766448

Claim:
An ink jet head comprising: a head main body including a metal portion and an ink passage which communicates with a nozzle which ejects an ink droplet; an actuator which applies ejection energy to ink contained in the ink passage; a power supply member which includes a base, and a driver IC chip which is mounted on the base and drives the actuator; a heat sink which makes an outer surface of the ink jet head, and opposes the driver IC chip; a first heat-transfer member which is positioned between the driver IC chip and the heat sink; and a second heat-transfer member which is positioned between the base and the metal portion, wherein the first heat-transfer member is in contact with the second heat-transfer member without interposition of the base, and both of the first heat-transfer member and the second heat-transfer member extend beyond a periphery of the base, and at a position beyond the periphery of the base, the first heat-transfer member is in contact with the second heat-transfer member.