A liquid ejecting head comprising: a fluid channel member comprising: a plurality of ejection holes; and a plurality of compression chambers connected to respective ejection holes, each having a diamond shape that has two obtuse angle portions and two acute angle portions; and a piezoelectric actuator substrate on the fluid channel member, so as to cover the plurality of compression chambers, and comprising: a first electrode on the fluid channel member; a piezoelectric body on the first electrode; and a plurality of second electrodes on the piezoelectric body, wherein, when the liquid ejecting head is viewed from the plan view, the plurality of compression chambers are arranged in substantially equal spacings in a direction of a row which runs along a diagonal connecting the two obtuse angle portions, and in a direction of a column which runs along a diagonal connecting the two acute angle portions, and the plurality of the second electrode comprises: a main electrode overlapping the plurality of compression chambers respectively, and contained inside the compression chamber and a lead-out electrode extending from a first end thereof which is connected to the main electrode to a second end thereof which is outside the compression chamber, wherein the lead-out electrode passes through one of the acute angle portions of the compression chamber, and the second end is located in a region that does not overlap with the column, wherein, when viewing the liquid ejecting head from the plan view, the plurality of lead-out electrodes extend in the direction of the row from the one of the acute angle portions of the compression chamber from which the lead-out electrode is led out, and the second end is provided on an imaginary line running parallel with the row passing through the one of the acute angle portions, or closer to the compression chamber than the imaginary line. a fluid channel member comprising: a plurality of ejection holes; and a plurality of compression chambers connected to respective ejection holes, each having a diamond shape that has two obtuse angle portions and two acute angle portions; and a plurality of ejection holes; and a plurality of compression chambers connected to respective ejection holes, each having a diamond shape that has two obtuse angle portions and two acute angle portions; and a piezoelectric actuator substrate on the fluid channel member, so as to cover the plurality of compression chambers, and comprising: a first electrode on the fluid channel member; a piezoelectric body on the first electrode; and a plurality of second electrodes on the piezoelectric body, wherein, when the liquid ejecting head is viewed from the plan view, a first electrode on the fluid channel member; a piezoelectric body on the first electrode; and a plurality of second electrodes on the piezoelectric body, the plurality of compression chambers are arranged in substantially equal spacings in a direction of a row which runs along a diagonal connecting the two obtuse angle portions, and in a direction of a column which runs along a diagonal connecting the two acute angle portions, and the plurality of the second electrode comprises: a main electrode overlapping the plurality of compression chambers respectively, and contained inside the compression chamber and a lead-out electrode extending from a first end thereof which is connected to the main electrode to a second end thereof which is outside the compression chamber, wherein a main electrode overlapping the plurality of compression chambers respectively, and contained inside the compression chamber and a lead-out electrode extending from a first end thereof which is connected to the main electrode to a second end thereof which is outside the compression chamber, wherein the lead-out electrode passes through one of the acute angle portions of the compression chamber, and the second end is located in a region that does not overlap with the column, wherein, when viewing the liquid ejecting head from the plan view, the plurality of lead-out electrodes extend in the direction of the row from the one of the acute angle portions of the compression chamber from which the lead-out electrode is led out, and the second end is provided on an imaginary line running parallel with the row passing through the one of the acute angle portions, or closer to the compression chamber than the imaginary line.