A liquid ejection head, comprising: a plurality of nozzles; and a supply passage through which a liquid is supplied to the nozzles, wherein the supply passage includes a first flow passage (67a-67d), and a second flow passage (66a-66d) connected to the first flow passage and including two sections that extend in mutually different directions from a connected position at which the first flow passage is connected to the second flow passage, the liquid being supplied to the second flow passage from the first flow passage, wherein the second flow passage has a liquid flow resistance larger in a first section (66a1, 66b1, 66c2, 66d2) as one of the two sections than in a second section (66a2, 66b2, 66c1, 66d1) as the other of the two sections, and wherein the first flow passage (67a-67d) is parallel to a first direction, and the first section (66a1, 66b1, 66c2, 66d2) and the second section (66a2,66b2, 66c1, 66d1) of the second flow passage (66a-66d) are parallel to a second direction orthogonal to the first direction and extend from the connected position toward mutually opposite directions in the second direction, characterized in that: a protrusion (65a-65d; 111a-111d; 121a-121d; 131a-131d) protruding toward the first flow passage is provided on an inner wall surface of the second flow passage facing the first flow passage, and a tip of the protrusion (65a-65d; 121a-121d; 131a-131d) is shifted toward the second section from a center of the first flow passage in the second direction. a plurality of nozzles; and a supply passage through which a liquid is supplied to the nozzles, wherein the supply passage includes a first flow passage (67a-67d), and a second flow passage (66a-66d) connected to the first flow passage and including two sections that extend in mutually different directions from a connected position at which the first flow passage is connected to the second flow passage, the liquid being supplied to the second flow passage from the first flow passage, a first flow passage (67a-67d), and a second flow passage (66a-66d) connected to the first flow passage and including two sections that extend in mutually different directions from a connected position at which the first flow passage is connected to the second flow passage, the liquid being supplied to the second flow passage from the first flow passage, wherein the second flow passage has a liquid flow resistance larger in a first section (66a1, 66b1, 66c2, 66d2) as one of the two sections than in a second section (66a2, 66b2, 66c1, 66d1) as the other of the two sections, and wherein the first flow passage (67a-67d) is parallel to a first direction, and the first section (66a1, 66b1, 66c2, 66d2) and the second section (66a2,66b2, 66c1, 66d1) of the second flow passage (66a-66d) are parallel to a second direction orthogonal to the first direction and extend from the connected position toward mutually opposite directions in the second direction, characterized in that: a protrusion (65a-65d; 111a-111d; 121a-121d; 131a-131d) protruding toward the first flow passage is provided on an inner wall surface of the second flow passage facing the first flow passage, and a tip of the protrusion (65a-65d; 121a-121d; 131a-131d) is shifted toward the second section from a center of the first flow passage in the second direction. a protrusion (65a-65d; 111a-111d; 121a-121d; 131a-131d) protruding toward the first flow passage is provided on an inner wall surface of the second flow passage facing the first flow passage, and a tip of the protrusion (65a-65d; 121a-121d; 131a-131d) is shifted toward the second section from a center of the first flow passage in the second direction.