Liquid jetting apparatus

A liquid jetting apparatus comprising:

• a pressure chamber formation member having first pressure chambers arranged in a first direction, and an insulation film covering the first pressure chambers;
• a cover joined to the pressure chamber formation member, the cover having a first convex portion and a second convex portion, each of the first convex portion and the second convex portion having a bonding surface to the pressure chamber formation member and extending in the first direction;
• and
• a wiring member joined to the pressure chamber formation member,
• wherein the first pressure chambers have first ends aligned in the first direction, second ends aligned in the first direction, and centers positioned between the first ends and the second ends in a second direction which is along a planar direction of the insulation film and orthogonal to the first direction;
• the centers of the respective first pressure chambers being positioned between the first convex portion and the second convex portion of the cover in relation to the second direction,
• the pressure chamber formation member has:
• first electrodes overlapping respectively with the first pressure chambers in a third direction orthogonal to the planar direction of the insulation film, while sandwiching the insulation film therebetween;
• a piezoelectric layer overlapping with the insulation film and the first electrodes in the third direction;
• a second electrode overlapping with the first electrodes in the third direction, while sandwiching the piezoelectric layer therebetween;
• first traces connected respectively with the first electrodes;
• and
• a second trace connected with the second electrode,
• the piezoelectric layer has a first surface facing the insulation film and the first electrodes, and a second surface on a side opposite to the insulation film and the first electrodes with respect to the first surface,
• the second trace is connected to the wiring member,
• the second trace includes an extending portion extending continuously from the second electrode to a contact point with the wiring member, and
• the piezoelectric layer is positioned between the insulation film and the extending portion of the second trace in relation to the third direction.