To extend the distance range that allows excellent power transmission while suppressing deterioration in power transmission efficiency to the minimum.

A non-contact power transmission system includes: a power-transmitting device 2 that has a signal generating part 11 for generating an AC signal S1 and a transmitting antenna 12 for generating an electromagnetic field by receiving supply of the AC signal S1; and a power-receiving device 3 having a receiving antenna 21 for generating an induced voltage V1 by the electromagnetic field and a rectifying part 23 for generating a voltage Vo to be supplied to a battery 4 on the basis of the induced voltage V1. The power transmitting device 2 includes: a first matching part 13 arranged between the signal generating part 11 and the transmitting antenna 12; and a first processing part 15 for executing first processing to match the signal generating part 11 with the transmitting antenna 12 by controlling the first matching part 13. The power receiving device 3 includes: a second matching part 22 arranged between the receiving antenna 21 and the rectifying part 23; and a second processing part 25 for executing second processing to match the receiving antenna 21 with the rectifying part 23 by controlling the second matching part 22.

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