A liquid ejection head includes a substrate and a flow path forming member. Energy generating elements that generate energy with which a liquid is ejected are formed on the substrate. The flow path forming member is disposed on the substrate and a flow path which encloses the energy generating elements is formed using the flow path forming member. Plural ejection ports that are in communication with the flow path are formed in the flow path forming member. A groove portion extending obliquely with respect to an X direction in which adjoining ejection ports are arranged is formed between the adjoining ejection ports in the flow path forming member.