An electrical storage device comprising: a fiber positive electrode including an electrically conductive fiber having a diameter of 0.1 to 100 μm, the fiber having a surface on which a positive electrode active material coating is formed, the positive electrode active material coating containing a transition metal oxide represented by a chemical formula 1 which is (Li 1-x A x) a M b X c O d; a fiber negative electrode formed from an electrically conductive fiber containing a negative electrode active material, the electrically conductive fiber having a diameter of 0.1 to 100 μm; a separator; and an electrolyte, wherein the fiber positive electrode and the fiber negative electrode are stacked alternately in such a manner that horizontal end positions of the fiber positive electrode and horizontal end positions of the fiber negative electrode are displaced from each other, and the fiber positive electrode and the fiber negative electrode are press-formed and cut vertically to form a fiber electrode stack; an insulating adhesive applied to the positive-electrode-protruding side of the fiber electrode stack has been removed such that a protruding end portion of the positive electrode is exposed, and a positive electrode terminal is formed on the exposed end portion of the positive electrode; an insulating adhesive applied to the negative-electrode-protruding side of the fiber electrode stack has been removed such that a protruding end portion of the negative electrode is exposed, and a negative electrode terminal is formed on the exposed end portion of the negative electrode; and in the chemical formula 1, A is at least one kind of alkali metal selected from the group consisting of Na, K, Rb, and Cs; M is at least one kind of transition metal selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, Ru, Pd, Ag, Ta, W, Ce, Pr, Sm, Eu, and Pb; X is at least one kind of typical elements selected from the group consisting of B, Al, Si, P, S, Ga, and Ge; and 0 < a ≤ 6, 1 ≤ b ≤ 5, 0 ≤ c ≤ 4, 0 < d ≤ 12, 0 ≤ a / b ≤ 4, and 0 ≤ x ≤ 0.5. a fiber positive electrode including an electrically conductive fiber having a diameter of 0.1 to 100 μm, the fiber having a surface on which a positive electrode active material coating is formed, the positive electrode active material coating containing a transition metal oxide represented by a chemical formula 1 which is (Li 1-x A x) a M b X c O d; a fiber negative electrode formed from an electrically conductive fiber containing a negative electrode active material, the electrically conductive fiber having a diameter of 0.1 to 100 μm; a separator; and an electrolyte, wherein the fiber positive electrode and the fiber negative electrode are stacked alternately in such a manner that horizontal end positions of the fiber positive electrode and horizontal end positions of the fiber negative electrode are displaced from each other, and the fiber positive electrode and the fiber negative electrode are press-formed and cut vertically to form a fiber electrode stack; an insulating adhesive applied to the positive-electrode-protruding side of the fiber electrode stack has been removed such that a protruding end portion of the positive electrode is exposed, and a positive electrode terminal is formed on the exposed end portion of the positive electrode; an insulating adhesive applied to the negative-electrode-protruding side of the fiber electrode stack has been removed such that a protruding end portion of the negative electrode is exposed, and a negative electrode terminal is formed on the exposed end portion of the negative electrode; and in the chemical formula 1, A is at least one kind of alkali metal selected from the group consisting of Na, K, Rb, and Cs; M is at least one kind of transition metal selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, Ru, Pd, Ag, Ta, W, Ce, Pr, Sm, Eu, and Pb; X is at least one kind of typical elements selected from the group consisting of B, Al, Si, P, S, Ga, and Ge; and 0 < a ≤ 6, 1 ≤ b ≤ 5, 0 ≤ c ≤ 4, 0 < d ≤ 12, 0 ≤ a / b ≤ 4, and 0 ≤ x ≤ 0.5. A is at least one kind of alkali metal selected from the group consisting of Na, K, Rb, and Cs; M is at least one kind of transition metal selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, Ru, Pd, Ag, Ta, W, Ce, Pr, Sm, Eu, and Pb; X is at least one kind of typical elements selected from the group consisting of B, Al, Si, P, S, Ga, and Ge; and 0 < a ≤ 6, 1 ≤ b ≤ 5, 0 ≤ c ≤ 4, 0 < d ≤ 12, 0 ≤ a / b ≤ 4, and 0 ≤ x ≤ 0.5.