A lithium-ion capacitor having: an electrode body laminated with a positive electrode having a positive electrode active material layer including a positive electrode active material, and a positive electrode current collector, a separator, and a negative electrode having a negative electrode active material layer including a negative electrode active material, and a negative electrode current collector, a non-aqueous electrolytic solution including a lithium ion; and an outer casing; characterized in that said positive electrode active material comprises activated carbon having a BET specific surface area of 2600 m 2 /g to 4500 m 2 /g, and having an average particle diameter of 1 μm to 30 μm, in which the mesopore volume V1 (cm 3 /g) derived from pores having a diameter of 2 nm to 50 nm (20 Å to 500 Å), calculated by the BJH method, is 0.8<V1<2.5, and the micro-pore volume V2 (cm 3 /g) derived from pores having a diameter of smaller than 2 nm (20 Å), calculated by the MP method, is 0.92<V2≤3.0; said positive electrode active material layer has a bulk density of 0.40 g/cm 3 to 0.70 g/cm 3, said negative electrode active material comprises a hard carbon material, in which the mesopore volume Vm1 (cm 3 /g) derived from pores having a diameter of 2 nm to 50 nm (20 Å to 500 Å), calculated by the BJH method, is 0.001≤Vm1≤0.01, and the micro-pore volume Vm2 (cm 3 /g) derived from pores having a diameter of smaller than 2 nm (20 Å), calculated by the MP method, is 0.001≤Vm2≤0.01, said positive electrode current collector is made of aluminum, and said negative electrode current collector is made of copper. an electrode body laminated with a positive electrode having a positive electrode active material layer including a positive electrode active material, and a positive electrode current collector, a separator, and a negative electrode having a negative electrode active material layer including a negative electrode active material, and a negative electrode current collector, a non-aqueous electrolytic solution including a lithium ion; and an outer casing; characterized in that said positive electrode active material comprises activated carbon having a BET specific surface area of 2600 m 2 /g to 4500 m 2 /g, and having an average particle diameter of 1 μm to 30 μm, in which the mesopore volume V1 (cm 3 /g) derived from pores having a diameter of 2 nm to 50 nm (20 Å to 500 Å), calculated by the BJH method, is 0.8<V1<2.5, and the micro-pore volume V2 (cm 3 /g) derived from pores having a diameter of smaller than 2 nm (20 Å), calculated by the MP method, is 0.92<V2≤3.0; said positive electrode active material layer has a bulk density of 0.40 g/cm 3 to 0.70 g/cm 3, said negative electrode active material comprises a hard carbon material, in which the mesopore volume Vm1 (cm 3 /g) derived from pores having a diameter of 2 nm to 50 nm (20 Å to 500 Å), calculated by the BJH method, is 0.001≤Vm1≤0.01, and the micro-pore volume Vm2 (cm 3 /g) derived from pores having a diameter of smaller than 2 nm (20 Å), calculated by the MP method, is 0.001≤Vm2≤0.01, said positive electrode current collector is made of aluminum, and said negative electrode current collector is made of copper.