An electric power transmission device, comprising: an alternating-current power supply; an electric power transmission portion configured to transmit in a non-contact manner, electric power output from said alternating-current power supply to an electric power reception device; and a filter circuit provided between said alternating-current power supply and said electric power transmission portion, said filter circuit including first and second coils (212, 216) provided in at least one of a power line pair connected between said alternating-current power supply and said electric power transmission portion, and first and second capacitors (214, 218) each connected between said power line pair and provided alternately with said first and second coils between said alternating-current power supply and said electric power transmission portion, said first and second coils and said first and second capacitors being provided in an order of said first coil, said first capacitor, said second coil, and said second capacitor from a side of said alternating-current power supply, characterized in that an inductance of said first coil is set to Z/ω, a capacitance of said first capacitor is set to (a+1)/(aωZ), an inductance of said second coil is set to aZ/ω, and a capacitance of said second capacitor is set to (a+1)/(a 2 ωZ), where ω represents a frequency of said alternating-current power supply, a represents a ratio of an output voltage from said filter circuit to an input voltage to said filter circuit, and Z represents any design value. an alternating-current power supply; an electric power transmission portion configured to transmit in a non-contact manner, electric power output from said alternating-current power supply to an electric power reception device; and a filter circuit provided between said alternating-current power supply and said electric power transmission portion, said filter circuit including first and second coils (212, 216) provided in at least one of a power line pair connected between said alternating-current power supply and said electric power transmission portion, and first and second capacitors (214, 218) each connected between said power line pair and provided alternately with said first and second coils between said alternating-current power supply and said electric power transmission portion, first and second coils (212, 216) provided in at least one of a power line pair connected between said alternating-current power supply and said electric power transmission portion, and first and second capacitors (214, 218) each connected between said power line pair and provided alternately with said first and second coils between said alternating-current power supply and said electric power transmission portion, said first and second coils and said first and second capacitors being provided in an order of said first coil, said first capacitor, said second coil, and said second capacitor from a side of said alternating-current power supply, characterized in that an inductance of said first coil is set to Z/ω, a capacitance of said first capacitor is set to (a+1)/(aωZ), an inductance of said second coil is set to aZ/ω, and a capacitance of said second capacitor is set to (a+1)/(a 2 ωZ),