A liquid ejection head comprising: an ejection surface (1a; 201a) having a plurality of ejection opening sets (108A, 108B) that are equally spaced apart from each other in a given direction, each of said ejection opening sets (108A, 108B) consisting of at least two ejection openings that are adjacent to each other in said given direction; a plurality of pressure chambers; a plurality of individual liquid channels connecting each of said pressure chambers to a corresponding one of said ejection opening sets (108A, 108B); and an ejection energy applier configured to apply an ejection energy to a liquid stored in selected at least one of said pressure chambers so as to cause liquid droplets to be ejected through at least one of said ejection opening sets (108A, 108B) that are connected to said selected at least one of said pressure chambers, such that the liquid droplets ejected through said at least two ejection openings constituting each of said at least one of said ejection opening sets (108A, 108B) cooperate with each other to form a single pixel, wherein said at least two ejection openings of each of said ejection opening sets (108A, 108B) are positioned relative to each other, such that a straight line (LA, LB) that is defined to connect between centers of said respective at least two ejection openings is parallel with said ejection surface (1a; 201a) and is inclined with respect to said given direction and a perpendicular direction that is perpendicular to said given direction, and such that said straight line defined in one of each adjacent two of said ejection opening sets (108A, 108B), which are adjacent to each other in said given direction, and said straight line defined in another of said each adjacent two of said ejection opening sets (108A, 108B), are inclined with respect to said perpendicular direction, in respective directions opposite to each other, characterized in that said plurality of pressure chambers are configured to store the liquid of a single color so that the liquid droplets of the single color are ejectable through said ejection opening sets (108A, 108B) that are connected to said pressure chambers, and said liquid ejection head is configured to perform an image recording, by ejecting the liquid droplets of the single color through said at least one of said ejection opening sets (108A, 108B), onto a recording medium during conveyance of the recording medium relative to said liquid ejection head in said perpendicular direction, without movement of the recording medium relative to said liquid ejection head in said given direction. an ejection surface (1a; 201a) having a plurality of ejection opening sets (108A, 108B) that are equally spaced apart from each other in a given direction, each of said ejection opening sets (108A, 108B) consisting of at least two ejection openings that are adjacent to each other in said given direction; a plurality of pressure chambers; a plurality of individual liquid channels connecting each of said pressure chambers to a corresponding one of said ejection opening sets (108A, 108B); and an ejection energy applier configured to apply an ejection energy to a liquid stored in selected at least one of said pressure chambers so as to cause liquid droplets to be ejected through at least one of said ejection opening sets (108A, 108B) that are connected to said selected at least one of said pressure chambers, such that the liquid droplets ejected through said at least two ejection openings constituting each of said at least one of said ejection opening sets (108A, 108B) cooperate with each other to form a single pixel, wherein said at least two ejection openings of each of said ejection opening sets (108A, 108B) are positioned relative to each other, such that a straight line (LA, LB) that is defined to connect between centers of said respective at least two ejection openings is parallel with said ejection surface (1a; 201a) and is inclined with respect to said given direction and a perpendicular direction that is perpendicular to said given direction, and such that said straight line defined in one of each adjacent two of said ejection opening sets (108A, 108B), which are adjacent to each other in said given direction, and said straight line defined in another of said each adjacent two of said ejection opening sets (108A, 108B), are inclined with respect to said perpendicular direction, in respective directions opposite to each other, characterized in that said plurality of pressure chambers are configured to store the liquid of a single color so that the liquid droplets of the single color are ejectable through said ejection opening sets (108A, 108B) that are connected to said pressure chambers, and said liquid ejection head is configured to perform an image recording, by ejecting the liquid droplets of the single color through said at least one of said ejection opening sets (108A, 108B), onto a recording medium during conveyance of the recording medium relative to said liquid ejection head in said perpendicular direction, without movement of the recording medium relative to said liquid ejection head in said given direction.