A head system comprising: a head; a first supply channel which has a first supply port configured to receive a liquid, and which extends between the first supply port and the head; and a first discharge channel which has a first discharge port configured to discharge the liquid and which extends between the first discharge port and the head, wherein: the head has two groups each including a manifold (M1, M2, M3, M4) which extends in a first direction and a plurality of pressure chambers each connected to the manifold (M1, M2, M3, M4) and a nozzle; the two groups include a first group and a second group arranged in an order of the first group and the second group in a second direction intersecting the first direction; one end of the manifold (M1, M2, M3, M4) included in each of the two groups is positioned on a first side in the first direction, and an opposite end of the manifold (M1, M2, M3, M4) included in each of the two groups is positioned on a second side in the first direction; the first supply channel is connected to the one end of the manifold (M1, M2, M3, M4) included in the first group, and is connected to the opposite end of the manifold (M1, M2, M3, M4) included in the second group; and the first discharge channel is connected to the opposite end of the manifold (M1, M2, M3, M4) included in the first group and is connected to the one end of the manifold (M1, M2, M3, M4) included in the second group; characterized in that: the respective one ends of the manifolds (M1, M2, M3, M4) of all of the two groups are positioned on the first side with respect to the respective other ends of the manifolds (M1, M2, M3, M4) of all of the two groups; and the second direction is orthogonal to the first direction, the one ends of the manifolds (M1, M2, M3, M4) of the two groups are aligned in the second direction, and the other ends of the manifolds (M1, M2, M3, M4) of the two groups are aligned in the second direction. a head; a first supply channel which has a first supply port configured to receive a liquid, and which extends between the first supply port and the head; and a first discharge channel which has a first discharge port configured to discharge the liquid and which extends between the first discharge port and the head, wherein: the head has two groups each including a manifold (M1, M2, M3, M4) which extends in a first direction and a plurality of pressure chambers each connected to the manifold (M1, M2, M3, M4) and a nozzle; the two groups include a first group and a second group arranged in an order of the first group and the second group in a second direction intersecting the first direction; one end of the manifold (M1, M2, M3, M4) included in each of the two groups is positioned on a first side in the first direction, and an opposite end of the manifold (M1, M2, M3, M4) included in each of the two groups is positioned on a second side in the first direction; the first supply channel is connected to the one end of the manifold (M1, M2, M3, M4) included in the first group, and is connected to the opposite end of the manifold (M1, M2, M3, M4) included in the second group; and the first discharge channel is connected to the opposite end of the manifold (M1, M2, M3, M4) included in the first group and is connected to the one end of the manifold (M1, M2, M3, M4) included in the second group; characterized in that: the respective one ends of the manifolds (M1, M2, M3, M4) of all of the two groups are positioned on the first side with respect to the respective other ends of the manifolds (M1, M2, M3, M4) of all of the two groups; and the second direction is orthogonal to the first direction, the one ends of the manifolds (M1, M2, M3, M4) of the two groups are aligned in the second direction, and the other ends of the manifolds (M1, M2, M3, M4) of the two groups are aligned in the second direction. the head has two groups each including a manifold (M1, M2, M3, M4) which extends in a first direction and a plurality of pressure chambers each connected to the manifold (M1, M2, M3, M4) and a nozzle; the two groups include a first group and a second group arranged in an order of the first group and the second group in a second direction intersecting the first direction; one end of the manifold (M1, M2, M3, M4) included in each of the two groups is positioned on a first side in the first direction, and an opposite end of the manifold (M1, M2, M3, M4) included in each of the two groups is positioned on a second side in the first direction; the first supply channel is connected to the one end of the manifold (M1, M2, M3, M4) included in the first group, and is connected to the opposite end of the manifold (M1, M2, M3, M4) included in the second group; and the first discharge channel is connected to the opposite end of the manifold (M1, M2, M3, M4) included in the first group and is connected to the one end of the manifold (M1, M2, M3, M4) included in the second group; characterized in that: the respective one ends of the manifolds (M1, M2, M3, M4) of all of the two groups are positioned on the first side with respect to the respective other ends of the manifolds (M1, M2, M3, M4) of all of the two groups; and the second direction is orthogonal to the first direction, the one ends of the manifolds (M1, M2, M3, M4) of the two groups are aligned in the second direction, and the other ends of the manifolds (M1, M2, M3, M4) of the two groups are aligned in the second direction.