A method for manufacturing a liquid discharge head includes providing a first layer containing a metal nitride to at least a portion on one surface of a silicon substrate corresponding to a supply port; providing a second layer on the first layer, the second layer including any one of aluminum, copper, and gold, or an alloy thereof; etching a portion of the silicon substrate corresponding to the supply port by reactive ion etching in a direction from the reverse surface towards the one surface so that the etched region reaches the first layer; and removing a portion of the first layer corresponding to the supply port and then removing a portion of the second layer corresponding to the supply port, thus forming the supply port.