The invention relates to a liquid ejecting head, a liquid ejecting head unit and a liquid ejecting apparatus. The liquid ejecting head comprises: a manifold substrate with manifolds disposed therein, wherein the manifold supplies liquid to a pressure generation chamber communicated with a nozzle; a piezoelectric element configured to change pressure of liquid within the pressure generation chamber; a sealing substrate with a vibration portion configured to be arranged in an area opposite to the manifold and absorb the pressure change of the liquid in the manifold; a head shell with a piezoelectric element housing portion for housing the piezoelectric element; an atmosphere exposure channel communicated with an atmosphere exposure port and a space portion arranged on the vibration portion and communicated with the atmosphere exposure channel by the other space portions.