A contactless power supplying system comprising: a power supplying device including: a power supplying housing including a front surface, which is a power supplying surface that extends in a certain direction, and a primary coil arranged in the power supplying housing and extending in the certain direction, wherein the primary coil is configured to generate alternating flux when receiving high-frequency current; and a movable device including: a power receiving housing including a rear surface, which is a power receiving surface, a coupling member arranged on an upper surface of the power receiving housing so that the power receiving housing is arranged at a certain position where the power receiving surface faces the power supplying surface, a secondary coil arranged in the power receiving housing, wherein the secondary coil is configured to interlink with the alternating flux and generate induced voltage, a power circuit arranged in the power receiving housing, wherein the power circuit is configured to generate output voltage from the induced voltage, and an output terminal extending out of the power receiving housing via a connection wire, wherein the output terminal is configured to output the output voltage of the power circuit, wherein the coupling member includes a guided portion, and an upper surface of the power supplying housing, which is a coupling surface, includes a guide portion that is configured to guide movement of the power receiving housing and the coupling member in the certain direction by engaging in a movable manner with the guided portion. a power supplying device including: a power supplying housing including a front surface, which is a power supplying surface that extends in a certain direction, and a primary coil arranged in the power supplying housing and extending in the certain direction, wherein the primary coil is configured to generate alternating flux when receiving high-frequency current; and a power supplying housing including a front surface, which is a power supplying surface that extends in a certain direction, and a primary coil arranged in the power supplying housing and extending in the certain direction, wherein the primary coil is configured to generate alternating flux when receiving high-frequency current; and a movable device including: a power receiving housing including a rear surface, which is a power receiving surface, a coupling member arranged on an upper surface of the power receiving housing so that the power receiving housing is arranged at a certain position where the power receiving surface faces the power supplying surface, a secondary coil arranged in the power receiving housing, wherein the secondary coil is configured to interlink with the alternating flux and generate induced voltage, a power circuit arranged in the power receiving housing, wherein the power circuit is configured to generate output voltage from the induced voltage, and an output terminal extending out of the power receiving housing via a connection wire, wherein the output terminal is configured to output the output voltage of the power circuit, wherein the coupling member includes a guided portion, and an upper surface of the power supplying housing, which is a coupling surface, includes a guide portion that is configured to guide movement of the power receiving housing and the coupling member in the certain direction by engaging in a movable manner with the guided portion. a power receiving housing including a rear surface, which is a power receiving surface, a coupling member arranged on an upper surface of the power receiving housing so that the power receiving housing is arranged at a certain position where the power receiving surface faces the power supplying surface, a secondary coil arranged in the power receiving housing, wherein the secondary coil is configured to interlink with the alternating flux and generate induced voltage, a power circuit arranged in the power receiving housing, wherein the power circuit is configured to generate output voltage from the induced voltage, and an output terminal extending out of the power receiving housing via a connection wire, wherein the output terminal is configured to output the output voltage of the power circuit,