A liquid discharge head includes a diaphragm, a first electrode, a piezoelectric body, and a second electrode which are stacked in this order in a first direction, in which when a region of the piezoelectric body interposed between the first electrode and the second electrode is set as a first region, a region of the piezoelectric body other than the first region is set as a second region, a portion of the diaphragm that overlaps a boundary between the first region and the second region when viewed in the first direction is set as a first portion, and a portion of the diaphragm that is different from the first portion and overlaps the first region when viewed in the first direction is set as a second portion, a thickness of the first portion is smaller than a thickness of the second portion.