A power-supplying device comprising: a housing cup which includes a bottom surface portion on which at least one driving device including a power-receiving device is placed and a side face portion extending outward from a peripheral edge portion of the bottom surface portion, the housing cup being formed so that an upper peripheral edge portion of the side face portion is an opening portion; and a magnetic field formation device configured to generate a variable magnetic field at a housing region surrounded by the bottom surface portion and the side face portion to allow the power-receiving device to receive power irrespective of the direction and position of the power-receiving device, the magnetic field formation device is characterised in that: at least one power supplying resonator configured to generate the variable magnetic field, wherein the at least one power supplying resonator is provided to oppose the bottom surface portion of the housing cup; a plurality of power-supplying coils (111, 112, 113) configured to generate an induced current in the at least one power supplying resonator, wherein the power-supplying coils (111, 112, 113) are provided at the side face portion of the housing cup, and the at least one power supplying resonator and the power-supplying coils (111, 112, 113) being disposed so that coil surfaces (111a, 112a, 121a) of the power supplying coils (111, 112, 113) and of the at least one power-supplying resonator oppose a predetermined region including the housing region surrounded by the bottom surface portion and the side face portion of the housing cup, and the magnetic field formation device outputting a variable current to one of output targets which are at least one of and not all of the power-supplying coils (111, 112) and being configured to repeatedly switch the output target to which the variable current is output. a housing cup which includes a bottom surface portion on which at least one driving device including a power-receiving device is placed and a side face portion extending outward from a peripheral edge portion of the bottom surface portion, the housing cup being formed so that an upper peripheral edge portion of the side face portion is an opening portion; and a magnetic field formation device configured to generate a variable magnetic field at a housing region surrounded by the bottom surface portion and the side face portion to allow the power-receiving device to receive power irrespective of the direction and position of the power-receiving device, the magnetic field formation device is characterised in that: at least one power supplying resonator configured to generate the variable magnetic field, wherein the at least one power supplying resonator is provided to oppose the bottom surface portion of the housing cup; a plurality of power-supplying coils (111, 112, 113) configured to generate an induced current in the at least one power supplying resonator, wherein the power-supplying coils (111, 112, 113) are provided at the side face portion of the housing cup, and the at least one power supplying resonator and the power-supplying coils (111, 112, 113) being disposed so that coil surfaces (111a, 112a, 121a) of the power supplying coils (111, 112, 113) and of the at least one power-supplying resonator oppose a predetermined region including the housing region surrounded by the bottom surface portion and the side face portion of the housing cup, and at least one power supplying resonator configured to generate the variable magnetic field, wherein the at least one power supplying resonator is provided to oppose the bottom surface portion of the housing cup; a plurality of power-supplying coils (111, 112, 113) configured to generate an induced current in the at least one power supplying resonator, wherein the power-supplying coils (111, 112, 113) are provided at the side face portion of the housing cup, and the at least one power supplying resonator and the power-supplying coils (111, 112, 113) being disposed so that coil surfaces (111a, 112a, 121a) of the power supplying coils (111, 112, 113) and of the at least one power-supplying resonator oppose a predetermined region including the housing region surrounded by the bottom surface portion and the side face portion of the housing cup, and the magnetic field formation device outputting a variable current to one of output targets which are at least one of and not all of the power-supplying coils (111, 112) and being configured to repeatedly switch the output target to which the variable current is output.