An element substrate of a liquid ejection head, comprising: a base material; an insulating film positioned on the base material; a heating resistance element configured to generate heat energy for ejecting a liquid; a protective film configured to cover the heating resistance element; a first electrical wiring layer, which is arranged in the insulating film, and is configured to supply a current to the heating resistance element; a second electrical wiring layer, which is arranged on a layer different from the first electrical wiring layer in the insulating film, and is configured to supply a current to the heating resistance element; and a plurality of connecting members configured to extend into the insulating film to connect the first electrical wiring layer and the heating resistance element, wherein the heating resistance element being configured to cause the current to flow in a first direction, the heating resistance element comprising a connecting region to which the plurality of connecting members is connected, the connecting region extending in a second direction intersecting the first direction, and the heating resistance element is divided into, in the first direction, two electrode regions each including the connecting region, and a center region positioned between the two electrode regions, characterized in that the arrangement of the plurality of connecting members is determined based on the formulae W = a min × n + b min × n − 1 + c × 2, c < a min + b min + c min when a width a [μm] represents a width of the connecting members in the second direction, a gap b [μm] represents a gap in the second direction between adjacent connecting members, an overlap width c [μm] represents a distance between the connecting members at both the ends and peripheral portions (101a, 101b) of the heating resistance element, a min, b min, and c min represent the minimum dimension for the layout, n represents a maximum number of the plurality of connecting members, and W [μm] represents a width of the heating resistance elements in the second direction. a base material; an insulating film positioned on the base material; a heating resistance element configured to generate heat energy for ejecting a liquid; a protective film configured to cover the heating resistance element; a first electrical wiring layer, which is arranged in the insulating film, and is configured to supply a current to the heating resistance element; a second electrical wiring layer, which is arranged on a layer different from the first electrical wiring layer in the insulating film, and is configured to supply a current to the heating resistance element; and a plurality of connecting members configured to extend into the insulating film to connect the first electrical wiring layer and the heating resistance element, wherein the heating resistance element being configured to cause the current to flow in a first direction, the heating resistance element comprising a connecting region to which the plurality of connecting members is connected, the connecting region extending in a second direction intersecting the first direction, and the heating resistance element is divided into, in the first direction, two electrode regions each including the connecting region, and a center region positioned between the two electrode regions, characterized in that the arrangement of the plurality of connecting members is determined based on the formulae W = a min × n + b min × n − 1 + c × 2, c < a min + b min + c min when a width a [μm] represents a width of the connecting members in the second direction, a gap b [μm] represents a gap in the second direction between adjacent connecting members, an overlap width c [μm] represents a distance between the connecting members at both the ends and peripheral portions (101a, 101b) of the heating resistance element, a min, b min, and c min represent the minimum dimension for the layout, n represents a maximum number of the plurality of connecting members, and W [μm] represents a width of the heating resistance elements in the second direction.