Liquid ejecting head and liquid ejecting apparatus

A liquid ejecting head comprising:

• a pressure chamber-forming member provided with a plurality of spaces each of which communicates with a nozzle and forms a pressure chamber;
• and
• a piezoelectric element in which a first electrode, a piezoelectric body layer, and a second electrode are stacked in order from a side relatively near to a displacement portion that tightly closes an opening of at least one of the spaces formed in the pressure chamber-forming member and that defines a portion of the pressure chamber,
• wherein the piezoelectric element is driven to displace the displacement portion so that pressure change is caused in a liquid within the pressure chamber and is utilized to eject the liquid from the nozzle, and
• wherein a ratio of a length of the opening in a direction orthogonal to a pressure chamber space juxtaposition direction in which the spaces are juxtaposed to a width of the opening in the pressure chamber space juxtaposition direction is greater than or equal to 4.3 and less than or equal to 6.0.