A liquid ejecting head unit includes a liquid ejecting head; an upstream flow path member that includes upstream flow paths; a downstream flow path member that includes downstream flow paths; and a seal member that includes pipe-shaped portions, which connect the upstream flow paths to the downstream flow paths and are provided with connecting flow paths through the inner portions of which a liquid flows, and is formed of an elastic material. The pipe-shaped portions are sealed due to inner walls thereof abutting at least one of the upstream flow path member and the downstream flow path member. The inner walls of the pipe-shaped portions include retaining portions that are provided along outer circumferences of the pipe-shaped portions so as to surround a region of the inner walls that abuts at least one of the upstream flow path member and the downstream flow path member.