Liquid ejection head and printing apparatus

A printing apparatus comprising:

• a liquid ejection head which comprises a first ejection port array and a second ejection port array arranged side by side and each formed by a plurality of ejection ports for ejecting liquid arrayed in a first direction, a first filter configured to filter a liquid to be supplied to the first ejection port array, a second filter configured to filter a liquid to be supplied to the second ejection port array, a first flow channel configured to supply the liquid from the first filter to the first ejection port array, and a second flow channel configured to supply the liquid from the second filter to the second ejection port array;
• and
• an attachment unit capable of attaching the liquid ejection head, wherein
• the first flow channel includes a first downstream flow channel communicating with the first ejection port array and a first upstream flow channel communicating with the first filter and the first downstream flow channel,
• the second flow channel includes a second downstream flow channel communicating with the second ejection port array and a second upstream flow channel communicating with the second filter and the second downstream flow channel,
• in a state where the liquid ejection head is in use,
• the first upstream flow channel has a first region which is located above the first downstream flow channel in a vertical direction and which is where a sectional area of the first upstream flow channel decreases from an upper side to a lower side in the vertical direction, and
• the second upstream flow channel has a second region which is located above the second downstream flow channel in the vertical direction and which is where a sectional area of the second upstream flow channel decreases from an upper side to a lower side in the vertical direction, and
• as viewed in the first direction, the first downstream flow channel and the second downstream flow channel do not overlap with each other, while the first region and the second region overlap with each other.