There is provided a head unit including: a first substrate provided with a first terminal and a second terminal; a second substrate provided with a third terminal; a first flexible wiring substrate that connects the first terminal and the third terminal to each other; a first driving module that is electrically connected to the second substrate; a third substrate provided with a fourth terminal; a second flexible wiring substrate that connects the second terminal and the fourth terminal to each other; a second driving module that is electrically connected to the third substrate; and a liquid flow passage which is positioned between the second substrate and the third substrate, and supplies the liquid to the first driving module and the second driving module, in which the first substrate is positioned on the second substrate side in a direction intersecting with a direction in which a liquid is discharged.