There is provided a liquid ejecting head unit that includes a liquid ejecting head ejecting liquid by driving a pressure generating element. The liquid ejecting head unit includes: the liquid ejecting head that includes first wiring substrates each having a connection wiring electrically connected to the pressure generating element and a support member that supports at least two first wiring substrates in different positions; a second wiring substrate that is commonly connected to the connection wirings of a plurality of the first wiring substrates electrically; and a head substrate to which the second wiring substrate is electrically connected. A connection portion connected to the head substrate is aligned on one face side of the second wiring substrate.