Joint structure, piezoelectric device, liquid ejecting head, liquid ejecting apparatus, and manufacturing method of joint structure

A joint structure comprising:

• a first substrate on which a resin portion which protrudes from one face and is formed of a resin, and a plurality of first electrodes which cover a part of the surface on the side opposite to the one face of the resin portion, are formed;
• and
• a second substrate on which a plurality of the second electrodes corresponding to the plurality of first electrodes are formed on the face which faces the one face,
• wherein the first substrate and the second substrate are joined in a state in which the first electrode and the second electrode corresponding to each other are electrically connected,
• wherein a region in which the resin portion is disposed on the one face of the first substrate includes a first region in which the resin portion is in contact with the one face, and a second region in which the resin portion is separated from the one face, and
• wherein the second region is formed on the outer side of the first region in the one face.