A line head assembly comprising: a line head including a first head, a second head and a third head arranged in a first direction, the second head being arranged between the first head and the third head in the first direction, positions of the first head and the third head being the same in a second direction orthogonal to and crossing the first direction, and the positions of the first head and the third head in the second direction being different from a position in the second direction of the second head such that the first head, second head and third head are arranged in a staggered manner; and a tank located above the line head in an up-down direction orthogonal to and crossing the first direction and the second direction, wherein each of the first head, the second head and the third head includes: a first intra-head channel including a first pressure chamber and a first nozzle; a first supply port connected to one end of the first intra-head channel; and a first discharge port connected to the other end of the first intra-head channel, and characterised in that the tank includes: a first supply channel formed in the tank and connected to the first supply port of the first head, the first supply port of the second head and the first supply port of the third head; and a first discharge channel formed in the tank and connected to the first discharge port of the first head, the first discharge port of the second head and the first discharge port of the third head. a line head including a first head, a second head and a third head arranged in a first direction, the second head being arranged between the first head and the third head in the first direction, positions of the first head and the third head being the same in a second direction orthogonal to and crossing the first direction, and the positions of the first head and the third head in the second direction being different from a position in the second direction of the second head such that the first head, second head and third head are arranged in a staggered manner; and a tank located above the line head in an up-down direction orthogonal to and crossing the first direction and the second direction, wherein each of the first head, the second head and the third head includes: a first intra-head channel including a first pressure chamber and a first nozzle; a first supply port connected to one end of the first intra-head channel; and a first discharge port connected to the other end of the first intra-head channel, and a first intra-head channel including a first pressure chamber and a first nozzle; a first supply port connected to one end of the first intra-head channel; and a first discharge port connected to the other end of the first intra-head channel, and characterised in that the tank includes: a first supply channel formed in the tank and connected to the first supply port of the first head, the first supply port of the second head and the first supply port of the third head; and a first discharge channel formed in the tank and connected to the first discharge port of the first head, the first discharge port of the second head and the first discharge port of the third head. a first supply channel formed in the tank and connected to the first supply port of the first head, the first supply port of the second head and the first supply port of the third head; and a first discharge channel formed in the tank and connected to the first discharge port of the first head, the first discharge port of the second head and the first discharge port of the third head.