A non-contact power transmission system comprising: a power transmission device; and a power reception device, the non-contact power transmission system performing power transmission in a non-contact manner, wherein the power transmission device includes: a power transmission coil; an oscillator that makes the power transmission coil oscillate; an oscillation controller that controls the oscillator so that the power transmission coil performs continuous oscillation, or intermittent oscillation in a predetermined cycle; and a current detector that outputs a detection value according to an input current flowing in the power transmission coil, wherein the power reception device includes: a power reception coil; a switch unit (SW1, SW2) that sets the power reception coil in a conductive state or a non-conductive state; and a switch controller that causes the switch unit to switch between the conductive state and the non-conductive state synchronously with the predetermined cycle, in a case of the intermittent oscillation, characterized in that the switch controller executes a switching operation of keeping the power reception coil in the conductive state during one oscillation period of the power transmission coil, and keeping the power reception coil in the non-conductive state during subsequent N (N is a predetermined natural number) oscillation periods of the power transmission coil, and wherein the oscillation controller causes the oscillator to switch the power transmission coil from the intermittent oscillation to the continuous oscillation when the detection value is equal to or above a predetermined threshold value during the one oscillation period of the power transmission coil and also the detection value is less than the threshold value during at least one of the subsequent N oscillation periods of the power transmission coil. a power transmission device; and a power reception device, the non-contact power transmission system performing power transmission in a non-contact manner, wherein the power transmission device includes: a power transmission coil; an oscillator that makes the power transmission coil oscillate; an oscillation controller that controls the oscillator so that the power transmission coil performs continuous oscillation, or intermittent oscillation in a predetermined cycle; and a current detector that outputs a detection value according to an input current flowing in the power transmission coil, a power transmission coil; an oscillator that makes the power transmission coil oscillate; an oscillation controller that controls the oscillator so that the power transmission coil performs continuous oscillation, or intermittent oscillation in a predetermined cycle; and a current detector that outputs a detection value according to an input current flowing in the power transmission coil, wherein the power reception device includes: a power reception coil; a switch unit (SW1, SW2) that sets the power reception coil in a conductive state or a non-conductive state; and a switch controller that causes the switch unit to switch between the conductive state and the non-conductive state synchronously with the predetermined cycle, in a case of the intermittent oscillation, a power reception coil; a switch unit (SW1, SW2) that sets the power reception coil in a conductive state or a non-conductive state; and a switch controller that causes the switch unit to switch between the conductive state and the non-conductive state synchronously with the predetermined cycle, in a case of the intermittent oscillation, characterized in that the switch controller executes a switching operation of keeping the power reception coil in the conductive state during one oscillation period of the power transmission coil, and keeping the power reception coil in the non-conductive state during subsequent N (N is a predetermined natural number) oscillation periods of the power transmission coil, and wherein the oscillation controller causes the oscillator to switch the power transmission coil from the intermittent oscillation to the continuous oscillation when the detection value is equal to or above a predetermined threshold value during the one oscillation period of the power transmission coil and also the detection value is less than the threshold value during at least one of the subsequent N oscillation periods of the power transmission coil.