A back electrode type solar cell comprising a semiconductor substrate, a first conductivity type semiconductor layer and a second conductivity type semiconductor layer arranged on one of two major surfaces of the semiconductor substrate, a first electrode layer corresponding to the first conductivity type semiconductor layer, and a second electrode layer corresponding to the second conductivity type semiconductor layer, wherein the solar cell comprises a specific region provided at the one major surface and not including the first electrode layer and the second electrode layer, each of the first electrode layer and the second electrode layer includes a plurality of strip branch electrode layers (27f, 37f) and a trunk electrode layer (27b, 37b) to which one end of each of the plurality of the strip branch electrode layers (27f, 37f) is connected, wherein the plurality of strip branch electrode layers of the first electrode layer and the plurality of strip branch electrode layers of the second electrode layer are interdigitated with each other, and the trunk electrode layer of the first electrode layer includes an enclosing trunk electrode layer enclosing an outer edge of the specific region and a strip trunk electrode layer extending from the enclosing trunk electrode layer, wherein in a first option the enclosing trunk electrode layer of the first electrode layer encloses one part of the outer edge of the specific region, and an enclosing trunk electrode layer of the second electrode layer encloses the part of the outer edge other than the one part of the specific region, and the strip trunk electrode layer of the first electrode layer and a strip trunk electrode layer of the second electrode layer are adjacent to each other; or, in a second option, the solar cell comprises a plurality of the specific regions, and wherein: each of the first electrode layer and the second electrode layer includes one or more of the trunk electrode layers (27b, 37b), the trunk electrode layer of the second electrode layer includes an enclosing trunk electrode layer and a strip trunk electrode layer extending from the enclosing trunk electrode layer, each enclosing trunk electrode layer of the first electrode layer encloses an outer edge of at least one specific region of a plurality of the specific regions, and each enclosing trunk electrode layer of the second electrode layer encloses an outer edge of at least one specific region of the other of a plurality of the specific regions. the solar cell comprises a specific region provided at the one major surface and not including the first electrode layer and the second electrode layer, each of the first electrode layer and the second electrode layer includes a plurality of strip branch electrode layers (27f, 37f) and a trunk electrode layer (27b, 37b) to which one end of each of the plurality of the strip branch electrode layers (27f, 37f) is connected, wherein the plurality of strip branch electrode layers of the first electrode layer and the plurality of strip branch electrode layers of the second electrode layer are interdigitated with each other, and the trunk electrode layer of the first electrode layer includes an enclosing trunk electrode layer enclosing an outer edge of the specific region and a strip trunk electrode layer extending from the enclosing trunk electrode layer, wherein in a first option the enclosing trunk electrode layer of the first electrode layer encloses one part of the outer edge of the specific region, and an enclosing trunk electrode layer of the second electrode layer encloses the part of the outer edge other than the one part of the specific region, and the strip trunk electrode layer of the first electrode layer and a strip trunk electrode layer of the second electrode layer are adjacent to each other; or, in a second option, the solar cell comprises a plurality of the specific regions, and wherein: each of the first electrode layer and the second electrode layer includes one or more of the trunk electrode layers (27b, 37b), the trunk electrode layer of the second electrode layer includes an enclosing trunk electrode layer and a strip trunk electrode layer extending from the enclosing trunk electrode layer, each enclosing trunk electrode layer of the first electrode layer encloses an outer edge of at least one specific region of a plurality of the specific regions, and each enclosing trunk electrode layer of the second electrode layer encloses an outer edge of at least one specific region of the other of a plurality of the specific regions.