A liquid ejection head, comprising: a first head unit (11b, 11d, 11f, 11h); a second head unit (11a, 11c, 11e, 11g) disposed adjacent to the first head unit (11b, 11d, 11f, 11h) in a first direction, the second head unit (11a, 11c, 11e, 11g) located on a first side of the first head unit (11b, 11d, 11f, 11h) in a second direction orthogonal to the first direction; and a heat uniforming unit (213; 313) shared by the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g), the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g) each comprising: a unit body comprising an actuator configured to cause ejection of liquid from a plurality of nozzles; an individual heat sink (14a, 14b) provided on each of the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g); and a first driver integrated circuit disposed on the first side of the unit body in the second direction, the first driver integrated circuit being configured to drive the actuator, the first driver integrated circuit being in thermal contact with the heat uniforming unit (213; 313) via the individual heat sink (14a, 14b), the heat uniforming unit (213; 313) comprising: a first heat uniforming member (271; 381) disposed on the first side of the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g) in the second direction; and an intermediate heat uniforming member (273; 382, 391) disposed on the first side of the first head unit (11b, 11d, 11f, 11h) in the second direction and disposed on a second side of the second head unit (11a, 11c, 11e, 11g) in the second direction, the first side and the second side being opposite sides in the second direction, the first heat uniforming member (271; 381) and the intermediate heat uniforming member (273; 382, 391) being in thermal contact with each other characterised in that a first side surface of the intermediate heat uniforming member (273; 282, 391) in the first direction is in direct contact with the individual heat sink of the first head unit; and a second side surface of the intermediate heat uniforming member (273; 382, 391) in the first direction is in direct contact with the individual heat sink of the second head unit. a first head unit (11b, 11d, 11f, 11h); a second head unit (11a, 11c, 11e, 11g) disposed adjacent to the first head unit (11b, 11d, 11f, 11h) in a first direction, the second head unit (11a, 11c, 11e, 11g) located on a first side of the first head unit (11b, 11d, 11f, 11h) in a second direction orthogonal to the first direction; and a heat uniforming unit (213; 313) shared by the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g), the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g) each comprising: a unit body comprising an actuator configured to cause ejection of liquid from a plurality of nozzles; an individual heat sink (14a, 14b) provided on each of the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g); and a first driver integrated circuit disposed on the first side of the unit body in the second direction, the first driver integrated circuit being configured to drive the actuator, the first driver integrated circuit being in thermal contact with the heat uniforming unit (213; 313) via the individual heat sink (14a, 14b), a unit body comprising an actuator configured to cause ejection of liquid from a plurality of nozzles; an individual heat sink (14a, 14b) provided on each of the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g); and a first driver integrated circuit disposed on the first side of the unit body in the second direction, the first driver integrated circuit being configured to drive the actuator, the first driver integrated circuit being in thermal contact with the heat uniforming unit (213; 313) via the individual heat sink (14a, 14b), the heat uniforming unit (213; 313) comprising: a first heat uniforming member (271; 381) disposed on the first side of the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g) in the second direction; and an intermediate heat uniforming member (273; 382, 391) disposed on the first side of the first head unit (11b, 11d, 11f, 11h) in the second direction and disposed on a second side of the second head unit (11a, 11c, 11e, 11g) in the second direction, the first side and the second side being opposite sides in the second direction, a first heat uniforming member (271; 381) disposed on the first side of the first head unit (11b, 11d, 11f, 11h) and the second head unit (11a, 11c, 11e, 11g) in the second direction; and an intermediate heat uniforming member (273; 382, 391) disposed on the first side of the first head unit (11b, 11d, 11f, 11h) in the second direction and disposed on a second side of the second head unit (11a, 11c, 11e, 11g) in the second direction, the first side and the second side being opposite sides in the second direction, the first heat uniforming member (271; 381) and the intermediate heat uniforming member (273; 382, 391) being in thermal contact with each other characterised in that a first side surface of the intermediate heat uniforming member (273; 282, 391) in the first direction is in direct contact with the individual heat sink of the first head unit; and a second side surface of the intermediate heat uniforming member (273; 382, 391) in the first direction is in direct contact with the individual heat sink of the second head unit.