A photoelectric conversion device comprising: a fluorescent light guide plate that includes a first surface, a second surface, and an edge surface that connects peripheral edges of the first surface and the second surface to each other and has a plate-shaped structure in which fluorescent substances that absorb at least a portion of components of sunlight and emit fluorescent light are dispersed in the fluorescent light guide plate or on the first surface or the second surface and which is formed of a material having a refractive index different from a refractive index of an outside, the fluorescent light guide plate being configured such that the fluorescent light emitted from the fluorescent substances are concentrated onto the edge surface to be emitted when the sunlight is incident from the first surface; a first photoelectric cell configured to generate power by being irradiated with the sunlight, the first photoelectric cell being mounted on the first surface of the fluorescent light guide plate; a lens layer configured such that light incident from an outer surface that is on a side opposite to a surface facing the first surface of the fluorescent light guide plate is concentrated onto the first photoelectric cell, the lens layer overlapping the first surface of the fluorescent light guide plate and the first photoelectric cell; a second photoelectric cell configured to generate power by being irradiated with the fluorescent light emitted from the edge surface, the second photoelectric cell being mounted on the edge surface of the fluorescent light guide plate; and power output units (10a, 10b) that extract power obtained in each of the first photoelectric cell and the second photoelectric cell. a fluorescent light guide plate that includes a first surface, a second surface, and an edge surface that connects peripheral edges of the first surface and the second surface to each other and has a plate-shaped structure in which fluorescent substances that absorb at least a portion of components of sunlight and emit fluorescent light are dispersed in the fluorescent light guide plate or on the first surface or the second surface and which is formed of a material having a refractive index different from a refractive index of an outside, the fluorescent light guide plate being configured such that the fluorescent light emitted from the fluorescent substances are concentrated onto the edge surface to be emitted when the sunlight is incident from the first surface; a first photoelectric cell configured to generate power by being irradiated with the sunlight, the first photoelectric cell being mounted on the first surface of the fluorescent light guide plate; a lens layer configured such that light incident from an outer surface that is on a side opposite to a surface facing the first surface of the fluorescent light guide plate is concentrated onto the first photoelectric cell, the lens layer overlapping the first surface of the fluorescent light guide plate and the first photoelectric cell; a second photoelectric cell configured to generate power by being irradiated with the fluorescent light emitted from the edge surface, the second photoelectric cell being mounted on the edge surface of the fluorescent light guide plate; and power output units (10a, 10b) that extract power obtained in each of the first photoelectric cell and the second photoelectric cell.