A bifacial solar cell comprising: a substrate; a plurality of first electrodes provided on a first surface of the substrate in a first direction; a plurality of first current collectors provided on the first surface in a second direction crossing the first direction, wherein the plurality of first current collectors are electrically and physically connected to the plurality of first electrodes; a plurality of second electrodes provided on a second surface of the substrate in the first direction; a plurality of second current collectors provided on the second surface in the second direction, the plurality of second current collectors being electrically and physically connected to the plurality of second electrodes; an emitter portion provided on the first surface; and an electric field portion of the first conductive type provided on the second surface, wherein an impurity concentration of the electric field portion is higher than an impurity concentration of the substrate, wherein the number of the plurality of second electrodes is more than the number of the plurality of first electrodes, the bifacial solar cell characterized in that: the plurality of first current collectors are perpendicular to the plurality of first electrodes, the plurality of second current collectors are perpendicular to the plurality of second electrodes, at least one of the plurality of second electrodes is positioned on a different reference line from a reference line of at least one of the plurality of first electrodes, the substrate is of a first conductive type and the emitter portion is of a second conductive type opposite the first conductive type, the plurality of first electrodes and the plurality of first current collectors contact the emitter portion, and the plurality of second electrodes and the plurality of second current collectors contact the electric field portion. a substrate; a plurality of first electrodes provided on a first surface of the substrate in a first direction; a plurality of first current collectors provided on the first surface in a second direction crossing the first direction, wherein the plurality of first current collectors are electrically and physically connected to the plurality of first electrodes; a plurality of second electrodes provided on a second surface of the substrate in the first direction; a plurality of second current collectors provided on the second surface in the second direction, the plurality of second current collectors being electrically and physically connected to the plurality of second electrodes; an emitter portion provided on the first surface; and an electric field portion of the first conductive type provided on the second surface, wherein an impurity concentration of the electric field portion is higher than an impurity concentration of the substrate, wherein the number of the plurality of second electrodes is more than the number of the plurality of first electrodes, the bifacial solar cell characterized in that: the plurality of first current collectors are perpendicular to the plurality of first electrodes, the plurality of second current collectors are perpendicular to the plurality of second electrodes, at least one of the plurality of second electrodes is positioned on a different reference line from a reference line of at least one of the plurality of first electrodes, the substrate is of a first conductive type and the emitter portion is of a second conductive type opposite the first conductive type, the plurality of first electrodes and the plurality of first current collectors contact the emitter portion, and the plurality of second electrodes and the plurality of second current collectors contact the electric field portion. the plurality of first current collectors are perpendicular to the plurality of first electrodes, the plurality of second current collectors are perpendicular to the plurality of second electrodes, at least one of the plurality of second electrodes is positioned on a different reference line from a reference line of at least one of the plurality of first electrodes, the substrate is of a first conductive type and the emitter portion is of a second conductive type opposite the first conductive type, the plurality of first electrodes and the plurality of first current collectors contact the emitter portion, and the plurality of second electrodes and the plurality of second current collectors contact the electric field portion.