In order to provide contactless power-feed equipment that can avoid excessive energy consumption upon switching, a primary side includes a DC power-supply device 11, a power-feed device 12, and a power-feed unit 13 and a secondary side includes a power-receiving unit 15. The power-feed device 12 includes: an insulating transformer 24 including a primary coil 22 with a center tap 22a fed with a DC current and a secondary coil 23 connected to the power-feed unit 13; a resonance capacitor 25 connected in parallel with the secondary coil 23 of the insulating transformer 24; a first diode 26 and a first Zener diode 29 that are connected to one end 22b of the primary coil 22; a second diode 27 and a second Zener diode 32 that are connected to the other end 22c of the primary coil 22; a first transistor 35 connected to the first diode 26, and a second transistor 36 connected to the second diode 27.