A fuel cell comprising: an electrolyte layer; a cathode layer provided at one side of the electrolyte layer; an anode layer provided at the other side of the electrolyte layer; and a current collecting member electrically connected to at least one of the cathode layer and the anode layer for collecting an electron or taking out an electricity to an exterior of the fuel cell, wherein at least one of the current collecting member and the cathode layer includes a perovskite type oxide which is represented by a general formula "ABO 3 " as a material thereof in which "A"-sites are occupied by "La" and "Sr" and "B"-sites are occupied by "Co" and a portion of "La" is substituted with "Sm" to be represented as "(La,Sm,Sr)CoO 3 " and wherein a mole composition ratio of "Sm" relative to the perovskite type oxide is smaller than a mole composition ratio of "La" before substitution relative to the perovskite type oxide, wherein the perovskite type oxide is represented by a formula as: La z-x Sm x Sr 1-z CoO 3.... wherein "z" represents the mole composition ratio of "La" before substitution relative to the perovskite type oxide and "x" represents the mole composition ratio of "Sm" relative to the perovskite type oxide; and wherein (i) in a case where the current collecting member includes the perovskite type oxide as the material thereof, the mole composition ratio "x" of "Sm" relative to the perovskite type oxide relative to the mole composition ratio "z" of "La" before substitution relative to the perovskite type oxide is within a range of 0.01 ≤ "x / z" < 0.5 and a mole composition ratio of "Sr" relative to the perovskite type oxide represented as "1 - z" is within a range of 0.2 ≤ "1 - z" ≤ 0.7; (ii) in a case where the cathode layer includes the perovskite type oxide as the material thereof, the relationship of values "x" and "z" is 0 < "x/z" < 0.72 and "z" = 0.5 in the formula. an electrolyte layer; a cathode layer provided at one side of the electrolyte layer; an anode layer provided at the other side of the electrolyte layer; and a current collecting member electrically connected to at least one of the cathode layer and the anode layer for collecting an electron or taking out an electricity to an exterior of the fuel cell, wherein at least one of the current collecting member and the cathode layer includes a perovskite type oxide which is represented by a general formula "ABO 3 " as a material thereof in which "A"-sites are occupied by "La" and "Sr" and "B"-sites are occupied by "Co" and a portion of "La" is substituted with "Sm" to be represented as "(La,Sm,Sr)CoO 3 " and wherein a mole composition ratio of "Sm" relative to the perovskite type oxide is smaller than a mole composition ratio of "La" before substitution relative to the perovskite type oxide, wherein the perovskite type oxide is represented by a formula as: La z-x Sm x Sr 1-z CoO 3.... wherein "z" represents the mole composition ratio of "La" before substitution relative to the perovskite type oxide and "x" represents the mole composition ratio of "Sm" relative to the perovskite type oxide; and wherein (i) in a case where the current collecting member includes the perovskite type oxide as the material thereof, the mole composition ratio "x" of "Sm" relative to the perovskite type oxide relative to the mole composition ratio "z" of "La" before substitution relative to the perovskite type oxide is within a range of 0.01 ≤ "x / z" < 0.5 and a mole composition ratio of "Sr" relative to the perovskite type oxide represented as "1 - z" is within a range of 0.2 ≤ "1 - z" ≤ 0.7; (ii) in a case where the cathode layer includes the perovskite type oxide as the material thereof, the relationship of values "x" and "z" is 0 < "x/z" < 0.72 and "z" = 0.5 in the formula. (i) in a case where the current collecting member includes the perovskite type oxide as the material thereof, the mole composition ratio "x" of "Sm" relative to the perovskite type oxide relative to the mole composition ratio "z" of "La" before substitution relative to the perovskite type oxide is within a range of 0.01 ≤ "x / z" < 0.5 and a mole composition ratio of "Sr" relative to the perovskite type oxide represented as "1 - z" is within a range of 0.2 ≤ "1 - z" ≤ 0.7; (ii) in a case where the cathode layer includes the perovskite type oxide as the material thereof, the relationship of values "x" and "z" is 0 < "x/z" < 0.72 and "z" = 0.5 in the formula.