In an ultrasonic bonding method, three ultrasonic bonding head units are disposed above a bonding target. At this time, initial heights in the three ultrasonic bonding head units are set to different heights from each other. Thereafter, a batch multiple lowering operation by a lifting-lowering servomotor and ultrasonic vibration operations by the three ultrasonic bonding head units are executed. At this time, a lowering speed V6 of the batch multiple lowering operation, an operation time T6 (min) of the ultrasonic vibration operation, and an adjustment gap length Δg among the initial heights are set to satisfy {T6