Liquid discharge substrate and liquid discharge head using liquid discharge substrate

A liquid discharge head comprising:

• a liquid discharge substrate including:
• a flow path substrate including a discharge port that discharges liquid and a flow path that supplies the liquid to the discharge port;
• a support substrate including an inlet path that communicates with the flow path, a concave portion provided corresponding to at least a part of the flow path, and an inlet path wall provided between the inlet path and the concave portion;
• and
• a flexible member that covers the concave portion, and is bonded to the inlet path wall of the support substrate and to an outer edge portion of the support substrate along a first direction via a first bonding member,
• the support substrate including, in plan view, the inlet path extending in the first direction of the support substrate, and a bonding extension portion adjacent to the inlet path in the first direction and adjacent to an end portion of the concave portion in a second direction intersecting the first direction,
• the first bonding member including, in plan view, protruding portions that protrude into the concave portion, and
• an electric connection portion that sends power and control signals to the liquid discharge substrate.