The parabolic trough collector includes a single-axis parabolic mirror (1) and a receiver tube (2) arranged at the focal point (F) of the parabolic mirror (1). The receiver tube (2) includes an absorber tube (4) and an outer tubular glass jacket (3) around it. To compensate for focusing errors in the parabolic collector and thus to reduce associated geometric optical losses, the tubular jacket (3)is provided with structural elements (9a, 9b, 9c), which focus the sunlight on the absorber tube (4) arranged in the tubular jacket (3) by reflection and/or refraction.