Protection device, in particular plant protection device, for protecting at least one cultivated plant (10, 10a; 10b; 10c), with a protection unit (12, 12a; 12b; 12c) comprising at least one protective element (14, 16, 14a, 16a; 14b, 16b; 14c, 16c) for protecting the at least one cultivated plant (10, 10a; 10b; 10c) from at least one weather condition and/or from a pest infestation, and with a support structure (18, 18a; 18b; 18c) for supporting the at least one protective element (14, 16, 14a, 16a; 14b, 16b; 14c, 16c), wherein the at least one protective element (14, 14a; 14b; 14c) is at least partially designed as a solar element (20, 20a, 21, 21a; 20b, 21b; 20c, 21c) for energy conversion, wherein the support structure (18, 18a; 18b; 18c) comprises at least two support planes (22, 24; 22b, 24b; 22c, 24c) which are arranged tilted relative to one another and are each configured for supporting at least one solar element (20, 20a, 21, 21a; 20b, 21b; 20c, 21c), wherein the at least two protective elements (14, 16, 14a, 16a; 14b, 16b; 14c, 16c) designed as solar elements (20, 20a, 21, 21a; 20b, 21b; 20c, 21c) are in each case arranged on the support planes (22, 24; 22b, 24b; 22c, 24c) which are tilted relative to one another, characterized in that the at least two solar elements (20, 20a, 21, 21a; 20b, 21b; 20c, 21c) delimit an air-circulation opening (26, 27; 26b; 26c) which is formed by a gap between the at least two solar elements (20, 20a, 21, 21a; 20b, 21b; 20c, 21c) along an axis perpendicular to a vertical axis, wherein at least one further protective element (16; 16b; 16c) is arranged at the air-circulation opening (26, 27; 26b; 26c). with a protection unit (12, 12a; 12b; 12c) comprising at least one protective element (14, 16, 14a, 16a; 14b, 16b; 14c, 16c) for protecting the at least one cultivated plant (10, 10a; 10b; 10c) from at least one weather condition and/or from a pest infestation, and with a support structure (18, 18a; 18b; 18c) for supporting the at least one protective element (14, 16, 14a, 16a; 14b, 16b; 14c, 16c), wherein the at least one protective element (14, 14a; 14b; 14c) is at least partially designed as a solar element (20, 20a, 21, 21a; 20b, 21b; 20c, 21c) for energy conversion, wherein the support structure (18, 18a; 18b; 18c) comprises at least two support planes (22, 24; 22b, 24b; 22c, 24c) which are arranged tilted relative to one another and are each configured for supporting at least one solar element (20, 20a, 21, 21a; 20b, 21b; 20c, 21c), wherein the at least two protective elements (14, 16, 14a, 16a; 14b, 16b; 14c, 16c) designed as solar elements (20, 20a, 21, 21a; 20b, 21b; 20c, 21c) are in each case arranged on the support planes (22, 24; 22b, 24b; 22c, 24c) which are tilted relative to one another, characterized in that the at least two solar elements (20, 20a, 21, 21a; 20b, 21b; 20c, 21c) delimit an air-circulation opening (26, 27; 26b; 26c) which is formed by a gap between the at least two solar elements (20, 20a, 21, 21a; 20b, 21b; 20c, 21c) along an axis perpendicular to a vertical axis, wherein at least one further protective element (16; 16b; 16c) is arranged at the air-circulation opening (26, 27; 26b; 26c).