A dye-sensitized solar cell element (100, 1000) comprising at least one dye-sensitized solar cell, the dye-sensitized solar cell including: a first base material having a transparent substrate; a second base material consisting of a counter electrode and facing the first base material; an oxide semiconductor layer provided between the first base material and the second base material; and an annular sealing portion connecting the first base material and the second base material, the transparent substrate being provided for the at least one dye-sensitized solar cell, a coating layer (19, 1019, 1119) being provided on the first base material, the coating layer (19, 1019, 1119) being capable of covering a light receiving surface, which is opposite to the second base material, of the transparent substrate and transmitting light, and the coating layer (19, 1019, 1119) including: an annular peripheral portion (19a, 1019a, 1119a); and a center portion (19b, 1019b, 1119b) provided at the inner side of the peripheral portion (19a, 1019a, 1119a), wherein an average thickness of the peripheral portion (19a, 1019a, 1119a) is smaller than a maximum thickness of the center portion (19b, 1019b, 1119b), wherein the peripheral portion (19a, 1019a, 1119a) of the coating layer (19, 1019, 1119) is, in a first case where the dye-sensitized solar cell element has one dye-sensitized solar cell, when a projection of an inner circumferential surface of the annular sealing portion is projected onto the coating layer (19, 1019, 1119), a portion at the outer side of the projection, or in a second case where the dye-sensitized solar cell element (100, 1000) has a plurality of the dye-sensitized solar cells and the sealing portions of the adjacent dye-sensitized solar cells are integrated with each other so as to form an integrated sealing portion comprising an annular portion at the outer side of the integrated sealing portion and a partitioning portion which is provided between two adjacent counter electrodes constituting the second base material and partitions an inner side opening of the annular-portion, when a projection of an inner circumferential surface of the annular portion is projected onto the coating layer (19, 1019, 1119), a portion at the outer side of the projection, or in a third case where the dye-sensitized solar cell element (100, 1000) has a plurality of the dye-sensitized solar cells and the sealing portions of the adjacent dye-sensitized solar cells are separated from each other, when an annular portion is formed by combining portions of the sealing portions facing the outer side of the sealing portion of each of the dye-sensitized solar cells with each other and when a projection of an inner circumferential surface of the annular portion is projected onto the coating layer, a portion at the outer side of the projection, characterized in that the coating layer (19, 1019, 1119) has a refractive index higher than a refractive index of the transparent substrate, and in that the entire transparent substrate is curved to be convex toward a side opposite to the coating layer (19, 1019, 1119). a first base material having a transparent substrate; a second base material consisting of a counter electrode and facing the first base material; an oxide semiconductor layer provided between the first base material and the second base material; and an annular sealing portion connecting the first base material and the second base material, the transparent substrate being provided for the at least one dye-sensitized solar cell, a coating layer (19, 1019, 1119) being provided on the first base material, the coating layer (19, 1019, 1119) being capable of covering a light receiving surface, which is opposite to the second base material, of the transparent substrate and transmitting light, and an annular peripheral portion (19a, 1019a, 1119a); and a center portion (19b, 1019b, 1119b) provided at the inner side of the peripheral portion (19a, 1019a, 1119a), wherein