A solid oxide fuel cell comprising: an anode; a cathode containing a perovskite complex oxide expressed by the general formula ABO 3 as a principal component, the perovskite complex oxide including at least one of La or Sr at the A site; and a solid electrolyte layer disposed between the anode and the cathode; wherein the cathode includes a cathode current collecting layer and a cathode active layer, the cathode active layer is disposed on a solid electrolyte layer side of the cathode current collecting layer, and at least one of the cathode current collecting layer and the cathode active layer includes a plurality of micro-cracks in an interface region (51a; 52a), the interface region (51a; 52a) being defined as a region within a distance (Da) of 0.5 micrometers from an interface between the cathode current collecting layer and the cathode active layer; wherein an average width of each of the plurality of micro-cracks is at least 1 nanometer to no more than 100 nanometers, an average length of each of the plurality of micro-cracks is at least 100 nanometers to no more than 1000 nanometers, characterized in that: the plurality of micro-cracks include at least one of: a micro-crack which is formed along a grain boundary between particles that configure the cathode active layer, a micro-crack which is formed to split a particle that configures the cathode active layer, and a micro-crack which is formed to connect a portion that is formed along a grain boundary between particles that configure the cathode active layer and a portion that is formed to split a particle that configures the cathode active layer. an anode; a cathode containing a perovskite complex oxide expressed by the general formula ABO 3 as a principal component, the perovskite complex oxide including at least one of La or Sr at the A site; and a solid electrolyte layer disposed between the anode and the cathode; wherein the cathode includes a cathode current collecting layer and a cathode active layer, the cathode active layer is disposed on a solid electrolyte layer side of the cathode current collecting layer, and at least one of the cathode current collecting layer and the cathode active layer includes a plurality of micro-cracks in an interface region (51a; 52a), the interface region (51a; 52a) being defined as a region within a distance (Da) of 0.5 micrometers from an interface between the cathode current collecting layer and the cathode active layer; wherein an average width of each of the plurality of micro-cracks is at least 1 nanometer to no more than 100 nanometers, an average length of each of the plurality of micro-cracks is at least 100 nanometers to no more than 1000 nanometers, the plurality of micro-cracks include at least one of: a micro-crack which is formed along a grain boundary between particles that configure the cathode active layer, a micro-crack which is formed to split a particle that configures the cathode active layer, and a micro-crack which is formed to connect a portion that is formed along a grain boundary between particles that configure the cathode active layer and a portion that is formed to split a particle that configures the cathode active layer.