A liquid ejection head includes a liquid ejection section including an element substrate having ejection ports for ejecting liquid and an electrical wiring substrate connected to a contact of the liquid ejection apparatus to transmit signals to the element substrate, a liquid tank loading section including a containing space for containing a liquid tank storing liquid to be supplied to the element substrate and a lock member having an engaging part for engaging with a holding part of the liquid tank and a fixation means for rigidly securing the liquid election section and the liquid tank loading section in position.